A metal airtight package high-power DC motor control module and interlocking circuit

Abstract

The present invention discloses a metal-encapsulated high-power DC motor control module and interlock circuit. The module includes a control circuit configured with: an input circuit, including a forward control circuit for providing a forward rotation trigger signal, a reverse control circuit for providing a reverse rotation trigger signal, a bias circuit for providing bias excitation to ensure that the output circuit has no output when the forward control circuit and the reverse control circuit lose power, and an interlock circuit for ensuring that the control circuit has only one valid steering control signal; an isolation drive circuit configured to convert the input circuit output into an optical signal, and then convert the optical signal into an electrical signal as a control signal output; and an output circuit configured to achieve on-off switching of the control circuit output under the control signal output by the isolation drive circuit. The control module provided by the present invention does not require an additional delay circuit, has a simple circuit structure, and is free of electromagnetic interference.

Description

Technical Field

[0001] The present invention belongs to the field of direct current motor control, and in particular relates to a metal airtight packaged high-power direct current motor control module and an interlocking circuit. Background Art

[0002] The traditional non-airtight DC motor control module adopts a box structure design. Multiple power control modules or electromagnetic control modules or contactors are installed inside the box to control the operation of the DC motor. The box adopts a structural plate and is fastened with screws. The advantages of this structure are easy processing, low cost and high load; the disadvantages are poor sealing, poor waterproof and dustproof, and poor vibration and impact resistance. It is not suitable for use in harsh environments such as islands, reefs, oceans, and wading environments.

[0003] High-power DC motor control modules, which utilize power transistors, MOSFETs, and IGBTs as output control devices in hermetically sealed metal packages, are widely used due to their lack of mechanical contacts, long lifespan, and reliable operation in harsh environments. These modules are currently being developed towards ever-smaller sizes and higher load currents. Traditional control modules, however, often utilize transformer isolation, making them susceptible to electromagnetic interference and requiring AC / DC signal processing. This often requires the addition of delay circuitry to ensure that the module's on-time is greater than its off-time, preventing simultaneous short circuits in the upper and lower arms of the output H-bridge. This results in complex circuitry. Summary of the Invention

[0004] The object of the present invention is to provide a metal airtight package high-power DC motor control module, the control circuit of which has no electromagnetic interference, effectively avoids the occurrence of output malfunction, and has a simple circuit structure.

[0005] To achieve the purpose of the present invention, the metal airtight packaged high-power DC motor control module provided herein includes a control circuit, wherein the control circuit is configured with:

[0006] The input circuit includes a forward control circuit for providing a forward trigger signal, a reverse control circuit for providing a reverse trigger signal, a bias circuit for providing bias excitation to ensure that the output circuit has no output when the forward control circuit and the reverse control circuit are powered off, and an interlock circuit for ensuring that the control circuit has only one valid steering control signal;

[0007] an isolation driving circuit configured to convert the input circuit output into an optical signal, and then convert the optical signal into an electrical signal as a control signal output; and

[0008] The output circuit is configured to realize on-off switching of the control circuit output under the control signal output by the isolation drive circuit.

[0009] In some embodiments, the control module provided by the present invention is also configured with an accelerated discharge circuit, which is used to accelerate the discharge of the output circuit capacitor and accelerate the shutdown of the control circuit when the input circuit is not excited and loaded; it includes a diode and a controllable device, the diode is used to prevent the charge on the output circuit capacitor from flowing back to the isolation drive circuit when the input circuit is not excited and loaded; the controllable device is used to quickly discharge the charge of the output circuit capacitor when the input circuit is not excited and loaded.

[0010] In some embodiments, the control module provided by the present invention is also configured with a first protection circuit for clamping the output circuit control signal to a set range to prevent the output circuit from oscillating; including a resistor connected in series between the output end of the isolation drive circuit and the input end of the output circuit and a voltage regulator diode connected in series between the input end of the output circuit and the circuit ground.

[0011] In some embodiments, the control module provided by the present invention is further configured with a second protection circuit for absorbing the output large voltage signal to protect the output circuit; the second protection circuit includes a transient suppression diode D12.

[0012] In some embodiments, the control module provided by the present invention also includes a tube shell, a first substrate, and a second substrate, and the first substrate and the second substrate are welded inside the tube shell; the first substrate and the second substrate are used for the distribution of the control circuit; the tube shell is equipped with input leads and output leads electrically connected to the control circuit; the tube shell includes a metal base and a metal cover, and the metal base and the metal cover are sealed by parallel sealing.

[0013] In some embodiments, the output lead resistance is less than 0.15 mΩ.

[0014] Another object of the present invention is to provide an interlock circuit, which is configured with a first input terminal, a second input terminal, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, wherein the first input terminal is connected to the control terminals of the transistor Q3 and the transistor Q4 respectively, the second input terminal is connected to the control terminals of the transistor Q1 and the transistor Q2 respectively, and the power supply terminals of the transistors Q1, Q2, Q3 and Q4 serve as output terminals.

[0015] In some embodiments, the interlock circuit provided by the present invention is further configured with resistors R1 to R8, wherein the resistor R1 and the resistor R3 are connected in series between the first input terminal and the circuit ground, and one end of the resistor R1 and the resistor R3 are connected to the control end of the transistor Q3 and the control end of the transistor Q4 via the resistor R7 and the resistor R8 respectively; the resistor R2 and the resistor R4 are connected in series between the second input terminal and the circuit ground, and one end of the resistor R1 and the resistor R3 are connected to the control end of the transistor Q1 and the control end of the transistor Q2 via the resistor R5 and the resistor R6 respectively.

[0016] The technical solution provided by the present invention has at least the following beneficial effects:

[0017] 1) The control module's input and output use optical isolation, utilizing photovoltaic characteristics to extend the on-time. This eliminates the need for an additional delay circuit, resulting in a simple circuit structure and optical isolation without electromagnetic interference. An interlocking circuit ensures that only one valid control instruction exists in the control circuit, effectively preventing malfunctions of the output. The bias circuit is configured so that when there is no forward or reverse excitation in the input circuit, the bias circuit applies a signal to the output circuit, causing it to have no output, short-circuiting the motor load and causing the motor to stop.

[0018] 2) Configure a fast discharge circuit to shorten the shutdown time and avoid output circuit short circuit.

[0019] 3) The configuration of the first protection circuit and the second circuit protection protects the output circuit and prevents oscillation.

[0020] 4) The metal base and metal cover of the control module are sealed by parallel sealing welding. After sealing, it has the advantages of high airtightness, high temperature resistance, corrosion resistance, moisture resistance, good shielding protection, and durability.

[0021] 5) The control module is equipped with a first substrate and a second substrate for controlling circuit distribution, thereby reducing the module's external dimensions and achieving a small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the invention and, together with the specification, serving to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and it is possible for a person skilled in the art to derive other drawings based on these drawings without inventive effort. In the drawings:

[0023] Figure 1 A cross-sectional view of the internal structure of the control module provided by the present invention;

[0024] Figure 2 One of the appearance drawings of the control module provided by the present invention;

[0025] Figure 3 This is the second appearance diagram of the control module provided by the present invention;

[0026] Figure 4 A circuit logic block diagram of the control circuit provided by the present invention;

[0027] Figure 5 A circuit schematic diagram of the control circuit provided by the present invention;

[0028] Figure 6 A circuit schematic diagram of the interlocking circuit provided by the present invention;

[0029] Figure 7 A simplified diagram of the output circuit provided by the present invention;

[0030] In the accompanying drawings: 1-tube shell, 2-first substrate, 3-second substrate, 4-metal base, 5-metal cover, 6-input lead-out terminal, 7-output lead-out terminal. DETAILED DESCRIPTION

[0031] Now refer to the attached Figure 1 ~Attachment Figure 7 More fully describe the example embodiments. However, the example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the invention will be thorough and complete and will fully convey the concept of the example embodiments to those skilled in the art.

[0032] In addition, the described features, structures or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, many specific details are provided to provide a full understanding of the embodiments of the invention. However, those skilled in the art will appreciate that the technical solutions of the invention may be practiced without one or more of the specific details, or other methods may be employed. In other cases, known methods, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the invention.

[0033] The present invention provides a high-power DC motor control module with a simple circuit structure and a metal airtight package, which is free of electromagnetic interference and effectively avoids output malfunction. Figure 1-Figure 3 The control module includes a tube shell 1, a first substrate 2, and a second substrate 3. The tube shell 1 includes a metal base 4 and a metal cover 5. The metal base 4 and the metal cover 5 are sealed by parallel sealing to achieve airtight sealing; the first substrate 2 and the second substrate 3 are welded inside the tube shell 1. The first substrate 2 and the second substrate 3 are used to control circuit distribution. The tube shell 1 is equipped with an input lead 6 and an output lead 7 electrically connected to the high-power DC motor control circuit.

[0034] Figure 4The circuit logic of the control circuit in the control module is shown. The circuit is configured with an input circuit, an isolation drive circuit, an accelerated discharge circuit, a first protection circuit, an output circuit, and a second protection circuit. The functional circuits are as follows:

[0035] The input circuit includes a forward control circuit for providing a forward trigger signal, a reverse control circuit for providing a reverse trigger signal, a bias circuit for providing bias excitation to ensure that the output circuit has no output when the forward control circuit and the reverse control circuit are powered off, and an interlock circuit to ensure that the control circuit has only one valid steering control signal.

[0036] Please combine Figure 5 、 Figure 6 The input circuit includes diodes D1 to D3, resistors R1 to R16, and transistors Q1 to Q4, wherein the diode D1, resistor R9, and resistor R10 constitute a forward control circuit, the diode D3, resistor R13, and resistor R14 constitute a reverse control circuit, the diode D2, resistor R11, resistor R12, resistor R15, and resistor R16 constitute a bias circuit, and the resistors R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8, transistor Q1, transistor Q2, transistor Q3, and transistor Q4 constitute an interlocking circuit. The connection relationship between the discrete components is as follows: the anode of diode D1 serves as the forward control terminal for forward excitation loading, and the cathode is connected to the power supply terminal of transistor Q1 through resistors R9 and R10; the cathode of diode D1 is also connected to the circuit ground through resistors R1 and R3, and the end connected to resistors R1 and R3 is connected to the control terminals of transistors Q3 and Q4 respectively through resistors R7 and R8; the anode of diode D2 serves as the bias terminal for bias excitation loading, and the cathode is connected to transistor Q2 through resistors R11 and R12. The cathode of diode D2 is also connected to the power supply terminal of transistor Q4 via resistors R15 and R16; the anode of diode D3 is used as the reverse control terminal for reverse excitation loading, and the cathode is connected to the power supply terminal of transistor Q3 via resistors R13 and R14; the cathode of diode D3 is also connected to the circuit ground via resistors R2 and R4, and the end connected to resistor R2 and resistor R4 is respectively connected to the control terminals of transistor Q1 and transistor Q2 via resistors R5 and R6; the power supply terminals of transistors Q1 to transistor Q4 are respectively used as output terminals.

[0037] The isolation driving circuit is configured to convert the input circuit output into an optical signal, and then convert the optical signal into an electrical signal as a control signal output.

[0038] Please combine Figure 5The isolation drive circuit includes a first optocoupler group, a second optocoupler group, a third optocoupler group, a fourth optocoupler group, and resistors R17 to R20. The input terminals of the first optocoupler group, the second optocoupler group, the third optocoupler group, and the fourth optocoupler group are connected to the power supply terminals of transistors Q1 to Q4, respectively. Each optocoupler group includes two optocouplers, namely optocouplers U1 to U8, and the circuit connection relationship is as follows: Figure 5 In other embodiments, each optocoupler group includes one or other number of optocouplers.

[0039] The output circuit is configured to switch the control circuit output on and off in response to a control signal output by the isolation drive circuit. The output circuit includes a first output controller, a second output controller, a third output controller, and a fourth output controller. The output ends of the first, second, third, and fourth optocoupler groups are connected to the control ends of the first, second, third, and fourth output controllers, respectively. The power supply ends of the first and third output controllers serve as power loading ends A for loading power V+, while the power supply ends of the second and fourth output controllers serve as power loading ends B for loading power V-. The output ends of the first and fourth output controllers are connected to the M+ terminal of the motor, while the output ends of the second and third output controllers are connected to the M- terminal of the motor.

[0040] The first to fourth output controllers are composed of single or multiple power transistors, MOSFETs, and IGBTs. Here, the first to fourth output controllers are composed of two low-resistance power MOSFETs. The resistance of the power MOSFETs is less than 2mΩ, making the total on-resistance of the output circuit less than 5mΩ. The specific structure is as follows: Figure 5 As shown, the first output controller includes field effect transistors V1-1 and V1-2, the second output controller includes field effect transistors V2-1 and V2-2, the third output controller includes field effect transistors V3-1 and V3-2, and the fourth output controller includes field effect transistors V4-1 and V4-2.

[0041] The output circuit of the control module is designed with low-resistance power field-effect transistors (MOSFETs) to form the bridge arm switches of the "H-bridge" DC motor control circuit to control the output of large current loads and the direction of current.

[0042] The control module output uses a power field-effect transistor to switch the output of a large current load. Any type of power field-effect transistor can be used. Here, a power field-effect transistor is used. The drain-source on-resistance of this type of field-effect transistor is extremely small (generally less than 2mΩ), ensuring that the output on-resistance of the control module remains below 5mΩ under three temperatures. This allows the control module to maintain power consumption within a low range under high current load conditions, ensuring that the operating temperature of all components inside the control module under three temperatures is much lower than the junction temperature of the components, thereby increasing the life of the control module.

[0043] The accelerated discharge circuit is used to accelerate the discharge of the output circuit capacitor and accelerate the shutdown of the control circuit when the input circuit is not excited and loaded; it includes a diode and a controllable device. The diode is used to prevent the charge on the output circuit capacitor from flowing back to the isolation drive circuit when the input circuit is not excited and loaded; the controllable device is used to quickly discharge the charge on the output circuit capacitor when the input circuit is not excited and loaded.

[0044] Please combine Figure 5 The accelerated discharge circuit includes transistors Q5 to Q8 and diodes D4 to D7. The emitter of transistor Q5 is connected to the control terminal of the first output controller, the collector is connected to the circuit ground, and the base is connected to the output terminal of the first optocoupler group. The anode of diode D4 is connected to the base of transistor Q5, and the cathode is connected to the emitter of transistor Q5. Transistors Q6 to Q8 and diodes D5 to D7 are matched with the second output controller, the third output controller and the fourth output controller respectively. Their connection relationship is the same as that of diode D4 and transistor Q5. See the attached figure for details. Figure 5 , I will not go into details here.

[0045] The first protection circuit is used to clamp the output circuit control signal to a set range to prevent the output circuit from oscillating; it includes a resistor connected in series between the output end of the isolation drive circuit and the input end of the output circuit, and a voltage-stabilizing diode connected in series between the input end of the output circuit and the circuit ground.

[0046] Combine Figure 5 The first protection circuit includes resistors R21 to R24 and Zener diodes D8 to D11.

[0047] The second protection circuit is used to absorb the output large voltage signal and protect the output circuit; the second protection circuit includes a transient suppression diode D12.

[0048] Figure 5The exemplary circuit structure of the control circuit provided by the present invention is shown. In combination with the figure, the input circuit includes a forward control circuit, a reverse control circuit, a bias circuit and an interlock circuit; the forward control circuit includes optocouplers U1 and U2 photovoltaic input terminals, chip resistors R9 and R10, and a diode D1; the reverse control circuit includes optocouplers U5 and U6 photovoltaic input terminals, chip resistors R13 and R14, and a diode D3; the bias circuit includes optocouplers U3, U4, U7, and U8 photovoltaic input terminals, chip resistors R11, R12, R15, and R16, and a diode D2; the interlock circuit includes chip resistors R1, R2, R3, R4, R5, R6, R7, and R8. 8. Transistors Q1, Q2, Q3, and Q4; the isolation drive circuit includes optocouplers U1, U2, U3, U4, U5, U6, U7, and U8, and chip resistors R17, R18, R19, and R20; the accelerated discharge circuit includes diodes D4, D5, D6, and D7, and transistors Q5, Q6, Q7, and Q8; the first protection circuit includes Zener diodes D8, D9, D10, and D11, and chip resistors R21, R22, R23, and R24; the output circuit includes field-effect transistors V1-1, V1-2, V2-1, V2-2, V3-1, V3-2, V4-1, and V4-2, and the second protection circuit includes a transient suppression diode D12.

[0049] The main working principle of this control circuit: Only the bias terminal Bias+ is powered on, and the two groups of optocoupler groups U3, U4 and U7, U8 respectively output and generate output voltages that act on the gate-source of field effect tubes V2 and V4 respectively. Field effect tubes V2 and V4 are turned on, the potential at both ends of the motor is equal, and the motor cannot work; Only the bias terminal Bias+ and the forward control CW+ are powered on, the transistor Q4 works and the reverse control terminal is not powered, the optocouplers U5 and U6 have no input, the voltage of U7 and U8 inputs is pulled low, and the optocouplers U5, U6, U7, and U8 have no output Voltage, field effect tubes V3 and V4 are in the cut-off state, and the two groups of optocouplers U1, U2 and U3, U4 are working. The output of each group of optocouplers generates an output voltage that acts on the gate source of field effect tubes V1 and V2. Field effect tubes V1 and V2 are turned on, and the motor rotates forward; only the bias terminal Bias+ and the reverse control CCW+ are powered on, the transistor Q2 is working and the forward control terminal is not powered, the optocouplers U1 and U2 have no input, the voltage of U3 and U4 inputs is pulled low, the optocouplers U1, U2, U3, and U4 have no output voltage, and the field effect tubes V1 and V2 are in the cut-off state. In the stop state, U5, U6 and U7, U8 two groups of photovoltaic work, each group of optocoupler output generates an output circuit acting on the gate source of field effect tubes V3 and V4, field effect tubes V3 and V4 are turned on, and the motor reverses; when the bias circuit Bias+, forward control CW+ and reverse control CCW+ are powered on at the same time, since the transistors Q1, Q2, Q3, and Q4 work at the same time, the voltage of the four groups of optocoupler input terminals is pulled down respectively, the output of the optocoupler group has no driving voltage, the output field effect tubes are all in the cut-off state, and the motor does not move; when the bias end is not powered, only the forward control or reverse control When power is applied, since there is no current input to photovoltaic devices U3, U4, U7, and U8, the output voltage is zero, and the corresponding field-effect transistors V2 and V4 are in the cutoff state. When only the forward control or reverse control signal is valid, only one set of field-effect transistors, V1 or V3, is turned on in the output circuit. No current flows through the motor load, and the motor does not operate. Diodes D1, D2, and D3 are reverse protection diodes to prevent reverse input connection. The function of Zener diodes D8, D9, D10, and D11 is to clamp the photovoltaic output voltage within the voltage range of the Zener diode, protecting the gate and source of the field-effect transistor from breakdown. The function of chip resistors R21, R22, R23, and R24 is to prevent oscillation caused by the parasitic capacitance and inductance of the gate, thus protecting the gate of the field-effect transistor. Diodes D4, D5, D6, D7, transistors Q5, Q6, Q7, and Q8 respectively form a fast gate-source discharge circuit for each field-effect transistor. When the input end is de-energized, the charge on the gate-source capacitance of the field-effect transistor is quickly discharged under the amplification effect of the PNP transistors Q3, Q4, Q5, and Q6, shortening the field-effect transistor turn-off time and reducing turn-off loss.

[0050] The output circuit of the control circuit is composed of power field effect tubes to form an "H-bridge" DC motor forward and reverse control circuit. The simplified circuit diagram is as follows Figure 7As shown. When only the bias terminal Bais+ of the control module input is energized, FETs V1 and V3 are disconnected, while FETs V2 and V4 are connected. No current flows through the motor load, and the motor does not operate. When the bias terminal Bais+ and the forward control terminal CW+ of the control module input are energized, FETs V1 and V2 are connected, while FETs V3 and V4 are disconnected. The output current direction is: (V+)-(V1)-(M+)-(M-)-(V2)-(V-), and the motor rotates forward. When the bias terminal Bais+ and the reverse control terminal CCW+ of the control module input are energized, FETs V1 and V2 are disconnected, while FETs V3 and V4 are connected. The output current direction is: (V+)-(V3)-(M-)-(M+)-(V4)-(V-), and the motor rotates reversely.

[0051] The input and output of this control module are optically isolated, utilizing photovoltaic characteristics to extend the on-time and a fast discharge circuit to shorten the off-time, preventing short circuits between the upper and lower arms of the output H-bridge circuit. Optical isolation isolates the input and output circuits, eliminating electromagnetic interference and simplifying the circuit. An interlock circuit is designed into the input circuit of this control module to ensure that only one valid control instruction exists in the control circuit, preventing output malfunctions. Low-resistance power field-effect transistors (MOSFETs) are designed into the output circuit to form the bridge arm switches of the "H-bridge" DC motor control module, controlling the on / off and current direction of the output high-current load. A bias circuit is designed into the input of this control module. When there is no forward or reverse excitation in the input circuit, the bias circuit applies a signal to the lower arm of the output circuit, short-circuiting the motor load and causing the motor to stop. A first protection circuit is configured at the gate of the output power MOSFET and a second protection circuit is configured at both ends of the motor load. The first protection circuit uses a Zener diode to clamp the gate voltage to prevent overvoltage damage to the MOSFET gate, and a chip resistor to protect the MOSFET gate and source, preventing oscillation. The second protection circuit uses a bidirectional transient suppression diode to absorb transient high voltages to prevent overvoltage damage to the output MOSFET drain and source.

[0052] The first substrate 2 in the control module is a printed circuit board, the second substrate 3 is a ceramic double-sided copper-clad board, the input circuit, isolation drive circuit, accelerated discharge circuit and first protection circuit are welded on the first substrate 2, and the output circuit and the second protection circuit are welded on the second substrate 3.

[0053] The bottom of the metal base 4 is made of copper and molybdenum from the outside to the inside, which has high thermal conductivity and reduces the thermal resistance of the heat dissipation channel of the internal field effect tube. The metal cover is made of 4J29. The metal base 4 and the metal cover 5 are sealed by parallel welding. The leakage rate after welding is less than 1×10- 3 Pa·m 3 / s; The metal material makes the tube shell 1 have the advantages of high airtightness, high temperature resistance, corrosion resistance, moisture resistance, good shielding protection, firmness and durability after sealing.

[0054] Input lead 6 is made of 4J29; output lead 7 is made of oxygen-free copper (TU1). This material, which is non-hydrogen embrittlement, highly conductive, corrosion-resistant, and has excellent machining and welding properties, reduces the resistance of a single output lead of the control module to less than 0.15mΩ, ensuring proper operation when connected to power-type loads. Both input and output leads 6 and 7 are nickel-plated.

[0055] The metal-encapsulated high-power DC motor control module provided herein comprises a housing 1, a first substrate 2, and a second substrate 3. The first and second substrates 2 and 3 are mounted within the housing 1. The current signal output by the input circuit is applied to the isolation drive circuit, controlling the current signal for the isolation drive circuit. The input circuit includes chip resistors, switching diodes, transistors, optocouplers, and Zener diodes. The components of the input and isolation drive circuits are all discrete devices soldered onto the first substrate 2. The output circuit includes a field-effect transistor chip and a bidirectional transient suppression diode chip soldered onto the second substrate 3, forming a hybrid structure.

[0056] The power control module provided by the present invention has a hybrid structure and its overall dimensions are only 62.5mm×50mm×22mm, which is much smaller than a high-power control module with the same load. In addition, the power control module can achieve a DC current load capacity of 45A (100A with a heat sink) in a small volume. Currently, there is no metal airtight packaged high-power DC motor control module with such a large load in the domestic metal package of the same volume.

[0057] The control module output uses a power field-effect transistor to switch the output of a large current load. Any type of power field-effect transistor can be used. Here, a power field-effect transistor is used. The drain-source on-resistance of this type of field-effect transistor is extremely small (generally less than 2mΩ), ensuring that the output on-resistance of the control module remains below 5mΩ under three temperatures. This allows the control module to maintain power consumption within a low range under high current load conditions, ensuring that the operating temperature of all components inside the control module under three temperatures is much lower than the junction temperature of the components, thereby increasing the life of the control module.

[0058] The DC motor power control module presented in this article utilizes low-resistance, high-thermal-conductivity materials and a control circuit with power field-effect transistors. Within a limited space, the product achieves a load of up to 45A (100A with a heat sink), improving the product's load-to-volume ratio and reducing material usage.

[0059] To improve the product's load capacity and increase the heat dissipation area of ​​the output field-effect transistor, this article places the input circuit, isolation drive circuit, and bleeder circuit all on a printed circuit board. The output circuit field-effect transistor and protection circuit transient suppression diode are placed on a copper-clad ceramic substrate.

[0060] The power control module presented in this article utilizes optical isolation for input and output, resulting in efficient internal space utilization and a compact structure. The input is a voltage-type input circuit, allowing for adjustment of the input voltage according to actual requirements. The output utilizes a fast-shutdown circuit, enabling rapid switching. The copper-clad ceramic board, connectors, and output terminals in the output circuit are all made of copper, which offers low resistance and high thermal conductivity, ensuring proper operation of the control module's output terminals when connected to power-type loads.

[0061] The input voltage specification of the power control module provided in this article can be changed by changing the input current limiting resistor of the control module to achieve the required control module specifications.

[0062] The present disclosure has been described using the aforementioned embodiments. However, the aforementioned embodiments are merely exemplary embodiments of the present disclosure. It should be noted that the disclosed embodiments do not limit the scope of the present disclosure. On the contrary, modifications and alterations made without departing from the spirit and scope of the present disclosure are within the scope of patent protection of the present disclosure.

Claims

1. A metal airtight package high-power DC motor control module, characterized in that: The module includes a control circuit configured with: The input circuit includes a forward control circuit for providing a forward trigger signal, a reverse control circuit for providing a reverse trigger signal, a bias circuit for providing bias excitation to ensure that the output circuit has no output when the forward control circuit and the reverse control circuit are powered off, and an interlock circuit for ensuring that the control circuit has only one valid steering control signal; an isolation driving circuit configured to convert the input circuit output into an optical signal, and then convert the optical signal into an electrical signal as a control signal output; as well as an output circuit configured to implement on-off switching of a control circuit output under a control signal output by the isolation drive circuit; The forward control circuit includes a resistor R9 and a resistor R10; The reverse control circuit includes a resistor R13 and a resistor R14; The bias circuit includes a resistor R11, a resistor R12, a resistor R15 and a resistor R16; The interlock circuit further includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4; One end of the resistor R9 is used as a forward rotation control end for forward rotation excitation loading, and the other end is connected to the power supply end of the transistor Q1 through the resistor R10; One end of the resistor R13 is used as a reverse control end for reverse excitation loading, and the other end is connected to the power supply end of the transistor Q3 through the resistor R14; One end of the resistor R11 is used as a bias end for bias excitation loading, and the one end is also connected to the power supply end of the transistor Q4 through the resistor R15 and the resistor R16, and the other end is connected to the power supply end of the transistor Q2 through the resistor R12; The resistor R1 and the resistor R3 are connected in series between the forward control terminal and the circuit ground, and the connected ends thereof are connected to the control terminal of the transistor Q3 and the control terminal of the transistor Q4 via the resistor R7 and the resistor R8 respectively; The resistor R2 and the resistor R4 are connected in series between the inversion control terminal and the circuit ground, and the connected ends thereof are connected to the control terminal of the transistor Q1 and the control terminal of the transistor Q2 via the resistor R5 and the resistor R6 respectively; The power supply ends of the transistors Q1 to Q4 are respectively connected to the isolation drive circuit as output ends.

2. The metal airtight packaged high-power DC motor control module according to claim 1, characterized in that: The control circuit is also configured with an accelerated discharge circuit, which is used to accelerate the discharge of the output circuit capacitor and accelerate the shutdown of the control circuit when the input circuit is not excited and loaded; it includes a diode and a controllable device, the diode is used to prevent the charge on the output circuit capacitor from flowing back to the isolation drive circuit when the input circuit is not excited and loaded; the controllable device is used to quickly discharge the charge on the output circuit capacitor when the input circuit is not excited and loaded.

3. The metal airtight packaged high-power DC motor control module according to claim 1, characterized in that: The control circuit is further configured with a first protection circuit for clamping the output circuit control signal to a set range to prevent the output circuit from oscillating; It includes a resistor connected in series between the output end of the isolation drive circuit and the input end of the output circuit, and a voltage-stabilizing diode connected in series between the input end of the output circuit and the circuit ground.

4. The metal airtight packaged high-power DC motor control module according to claim 1, characterized in that: The control circuit is further configured with a second protection circuit for absorbing the output large voltage signal to protect the output circuit; the second protection circuit includes a transient suppression diode D12.

5. The metal airtight packaged high-power DC motor control module according to claim 1, characterized in that: The forward control circuit, the reverse control circuit and / or the bias circuit further include a reverse protection diode for preventing reverse excitation connection.

6. The metal airtight packaged high-power DC motor control module according to claim 5, characterized in that: The isolation driving circuit includes a first optocoupler group, a second optocoupler group, a third optocoupler group and a fourth optocoupler group, and the input ends of the first optocoupler group, the second optocoupler group, the third optocoupler group and the fourth optocoupler group are electrically connected to the power supply ends of the transistor Q1, the transistor Q2, the transistor Q3 and the transistor Q4 respectively.

7. The metal airtight packaged high-power DC motor control module according to claim 6, characterized in that: The first optocoupler group, the second optocoupler group, the third optocoupler group, and the fourth optocoupler group each include two photoelectric couplers.

8. The metal airtight packaged high-power DC motor control module according to claim 6, characterized in that: The output circuit includes a first output controller, a second output controller, a third output controller and a fourth output controller. The output ends of the first output controller, the second output controller, the third output controller and the fourth output controller are respectively connected to the control ends of the first output controller, the second output controller, the third output controller and the fourth output controller. The power supply ends of the first output controller and the third output controller serve as power loading ends A for loading power V+, and the power supply ends of the second output controller and the fourth output controller serve as power loading ends B for loading power V-. The output ends of the first output controller and the fourth output controller are used to connect to the M+ end of the motor, and the output ends of the second output controller and the third output controller are used to connect to the M- end of the motor.

9. The metal airtight packaged high-power DC motor control module according to claim 8, characterized in that: The first output controller, the second output controller, the third output controller, and the fourth output controller each include a first field effect transistor and a second field effect transistor.

10. The metal airtight packaged high-power DC motor control module according to claim 1, characterized in that: The invention also comprises a tube shell (1), a first substrate (2), and a second substrate (3), wherein the first substrate (2) and the second substrate (3) are welded inside the tube shell (1); the first substrate (2) and the second substrate (3) are used for distributing the control circuit; the tube shell (1) is equipped with an input lead (6) and an output lead (7) electrically connected to the control circuit; the tube shell (1) comprises a metal base (4) and a metal cover plate (5), and the metal base (4) and the metal cover plate (5) are sealed by parallel sealing welding.

11. The metal airtight packaged high-power DC motor control module according to claim 10, characterized in that: The metal base (4) and the metal cover plate (5) have a leakage rate lower than 1× 10-3Pa·m3 / s.

12. The metal airtight packaged high-power DC motor control module according to claim 10, characterized in that: The resistance of the output lead (7) is lower than 0.15 mΩ.

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