Millimeter wave isolation driving circuit and electronic equipment

Abstract

The invention provides a millimeter wave isolation driving circuit and electronic equipment. The driving circuit comprises a low-voltage side control module, a high-voltage side control module and a millimeter wave isolation module, the low-voltage side control module is connected with the high-voltage side control module through the millimeter wave isolation module; a power supply circuit is also included; the power supply circuit comprises an inverter, a transformer, a rectifier and a feedback adjustment module which are connected in sequence; primary coils of the inverter and the transformer are positioned on the low-voltage side; the input end of the inverter is connected with a low-voltage side power supply; a secondary coil of the transformer, the rectifier and the feedback adjustment module are located at a high-voltage side; the output end of the rectifier is also connected with the high-voltage side control module; the output end of the feedback adjustment module is connected with the low-voltage side control module through the millimeter wave isolation module; and the low-voltage side control module is also connected with the inverter. According to the invention, the power supply design can be optimized, and the isolation performance can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of digital isolators, and in particular to millimeter wave isolation drive circuits and electronic equipment. Background Art

[0002] High voltage circuits are widely used in people's daily lives, such as power supply circuits and motor drive circuits; the battery fast charging technology used in handheld devices is a classic application of high voltage circuits. Among them, the isolation drive of power devices in high voltage circuits has a wide range of application requirements.

[0003] A typical isolation drive circuit usually consists of a low voltage area (Low voltage field), an isolator (Isolator) and a high voltage area (High voltage field). Among them, the low voltage area is usually a controller and a drive signal; the high voltage area is usually a protection circuit and a drive circuit. Signals need to be transmitted between the high voltage area and the low voltage area, and high isolation is also required to prevent the high voltage area from damaging the low voltage area. The device used to transmit signals is called an isolator.

[0004] At present, the high-voltage side of mainstream isolators uses external power supply, which has the following disadvantages:

[0005] (1) Slow power-on speed; additional power-on structure is required on the power-consuming side;

[0006] (2) The static current and voltage of the high-voltage side circuit are large; therefore, the power loss is large, which can reach several hundred milliwatts;

[0007] (3) Affected by external factors: When a serious fault occurs in the high-voltage power supply, the high-voltage protection circuit is easily damaged. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, one object of the present invention is to provide a millimeter wave isolation driving circuit that can optimize power supply design and improve isolation performance.

[0009] A second object of the present invention is to provide an electronic device, wherein the power supply design and isolation performance of the driving circuit are optimized.

[0010] To achieve the above-mentioned object, the first embodiment of the present invention proposes a millimeter wave isolation driving circuit, comprising a low-voltage side control module located on the low-voltage side, a high-voltage side control module located on the high-voltage side, and a millimeter wave isolation module; the low-voltage side control module is connected to the high-voltage side control module through the millimeter wave isolation module;

[0011] It also includes a power supply circuit; the power supply circuit includes an inverter, a transformer, a rectifier and a feedback adjustment module connected in sequence; the primary coils of the inverter and the transformer are located on the low-voltage side; the input end of the inverter is connected to the low-voltage side power supply; the secondary coil of the transformer, the rectifier and the feedback adjustment module are located on the high-voltage side; the output end of the rectifier is also connected to the high-voltage side control module; the output end of the feedback adjustment module is connected to the low-voltage side control module through the millimeter wave isolation module; the low-voltage side control module is also connected to the inverter.

[0012] According to a millimeter wave isolation driving circuit of an embodiment of the present invention, a millimeter wave isolation module is used for isolated transmission between the low voltage side and the high voltage side, so that the driving circuit has: the bandwidth of the isolated transmission can reach 1Mbps to 10Gbps, which is suitable for any scenario and has the advantage of fast isolated transmission speed; the millimeter wave carrier antenna is small and supports chip embedding, which has the advantages of higher integration, smaller size and lower cost; the millimeter wave wireless isolation method will not cause metal short circuit even if it is penetrated, and has higher isolation safety and isolation reliability. More importantly, the optimized power supply design with power on the low voltage side can not only reduce power consumption and optimize heat dissipation; but also strengthen loop control and more accurately monitor the power supply status of the high voltage side, thereby broadening the application scenarios of the driving circuit.

[0013] In addition, the millimeter wave isolation driving circuit proposed in the above embodiment of the present invention may also have the following additional technical features:

[0014] Optionally, the millimeter wave isolation module includes a low-voltage side isolation circuit and a high-voltage side isolation circuit; the low-voltage side isolation circuit is located on the low-voltage side, and the high-voltage side isolation circuit is located on the high-voltage side; the low-voltage side isolation circuit is connected to the low-voltage side control module, and the high-voltage side isolation circuit is connected to the high-voltage side control module, and the low-voltage side isolation circuit and the high-voltage side isolation circuit are wirelessly connected based on millimeter waves.

[0015] Optionally, the low-voltage side power supply is also connected to the low-voltage side control module and the low-voltage side isolation circuit respectively; the output end of the rectifier is also connected to the high-voltage side isolation circuit and the feedback adjustment module respectively.

[0016] Optionally, the power supply module also includes a first voltage regulator and a second voltage regulator; the first voltage regulator is located on the low-voltage side, and the second voltage regulator is located on the high-voltage side; the low-voltage side power supply is respectively connected to the low-voltage side control module and the low-voltage side isolation circuit through the first voltage regulator; the output end of the rectifier is divided into two paths, one path is respectively connected to the high-voltage side control module, the high-voltage side isolation circuit and the feedback adjustment module through the second voltage regulator; the other path is directly connected to the feedback adjustment module.

[0017] Optionally, the low-voltage side isolation circuit includes a first transmitting unit, a first transmitting antenna, a second receiving antenna and a second receiving unit; the first transmitting unit is respectively connected to the driving signal output end of the low-voltage side control module and the first transmitting antenna; the second receiving unit is respectively connected to the feedback signal input end of the low-voltage side control module and the second receiving antenna;

[0018] The high-voltage side isolation circuit includes a first receiving antenna, a first receiving unit, a second transmitting unit and a second transmitting antenna; the first receiving unit is respectively connected to the driving signal input end of the high-voltage side control module and the first receiving antenna; the second transmitting unit is respectively connected to the feedback signal output end of the feedback adjustment module and the second transmitting antenna.

[0019] Optionally, the inverter includes a lower inverter bridge, an upper inverter bridge and a control switch; the low-voltage side control module is connected to the lower inverter bridge and the upper inverter bridge connected in sequence through the control switch; and the connecting line between the lower inverter bridge and the upper inverter bridge is connected to the primary coil.

[0020] Optionally, the lower inverter bridge and the upper inverter bridge are mirror structures of each other, and both include two MOS tubes, two capacitors and two resistors; the two resistors connected in series are connected between the gates of the two MOS tubes; the gates of the two MOS tubes are also respectively connected to the drain of the corresponding other MOS tube through a capacitor; the sources of the two MOS tubes are connected;

[0021] The drains of the two MOS tubes in the lower inverter bridge are respectively connected to the drains of the two MOS tubes in the upper inverter bridge; the drains of the two MOS tubes in the lower inverter bridge are also respectively connected to the two ends of the primary coil; the sources of the two MOS tubes in the upper inverter bridge are connected to the low-voltage side power supply; the sources of the two MOS tubes in the lower inverter bridge are connected to the control switch.

[0022] Optionally, the two MOS transistors in the lower inverter bridge are both N-channel MOS transistors; and the two MOS transistors in the upper inverter bridge are both P-channel MOS transistors.

[0023] Optionally, the rectifier includes a rectifier tube D1, a rectifier tube D2, a rectifier tube D3, a rectifier tube D4 and a capacitor C5;

[0024] The rectifier tube D1 and the rectifier tube D3 are connected in series in the same direction; the rectifier tube D2 and the rectifier tube D4 are connected in series in the same direction; one end of the secondary coil is connected to the connecting line between the rectifier tube D1 and the rectifier tube D3, and the other end thereof is connected to the connecting line between the rectifier tube D2 and the rectifier tube D4; after the rectifier tube D1 and the rectifier tube D3 connected in series, the rectifier tube D2 and the rectifier tube D4 connected in series, and the capacitor C5 are connected in parallel, one end is grounded, and the other end serves as the output end of the rectifier.

[0025] To achieve the above object, a second aspect of the present invention provides an electronic device, including the above-mentioned millimeter wave isolation driving circuit.

[0026] According to the electronic device provided in this embodiment, the above-mentioned millimeter wave isolation driving circuit is used to make its isolation driving performance more stable, safe and reliable, and the isolation transmission speed can also be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the circuit structure of a millimeter wave isolation drive circuit provided by an embodiment of the present invention;

[0028] Figure 2 A schematic diagram of the specific structure of a millimeter wave isolation drive circuit provided by an embodiment of the present invention;

[0029] Figure 3 A schematic diagram of the circuit structure of an inverter to rectifier in a power supply circuit in a millimeter wave isolation drive circuit provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the principle of a monitoring feedback regulation loop in a millimeter wave isolation drive circuit provided by an embodiment of the present invention;

[0031] Figure 5 A signal timing waveform diagram of a feedback loop in a millimeter wave isolation drive circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0033] The millimeter wave isolation drive circuit of the present invention adopts an optimized power supply design with power on the low-voltage side, which can not only reduce power consumption, but also strengthen loop feedback control and improve the monitoring accuracy of the high-voltage side circuit state, thereby broadening the application scenarios.

[0034] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Figure 1 A schematic diagram of the circuit structure of a millimeter wave isolation drive circuit provided in an embodiment of the present invention.

[0037] like Figure 1 As shown, a millimeter wave isolation driving circuit provided by an embodiment of the present invention includes a low-voltage side control module located on the low-voltage side, a high-voltage side control module located on the high-voltage side, and a millimeter wave isolation module; the low-voltage side control module and the high-voltage side control module perform wireless isolation communication interaction through the millimeter wave isolation module.

[0038] The millimeter wave isolation driving circuit of this embodiment also includes a power supply circuit; Figure 1 As shown, the power supply circuit includes an inverter, a transformer, a rectifier and a feedback adjustment module; the inverter, transformer, rectifier and feedback adjustment module are connected in sequence. Among them, the primary coils of the inverter and the transformer are located on the low-voltage side; the input end of the inverter is connected to the low-voltage side power supply VCC1; the secondary coil of the transformer, the rectifier and the feedback adjustment module are located on the high-voltage side; the output end voltage VCCS of the rectifier will be divided into two paths, one of which is transmitted to the high-voltage side control module for power supply of the high-voltage side module; the other is transmitted to the input end of the feedback adjustment module for feedback monitoring; the output end of the feedback adjustment module is connected to the low-voltage side control module through the millimeter wave isolation module; the low-voltage side control module is also connected to the inverter.

[0039] In the above power supply circuit, the power supply line is composed of the low-voltage side power supply VCC1-inverter-transformer-rectifier, and the low-voltage side is powered on to power each module on the high-voltage side. The monitoring feedback regulation loop is composed of the inverter-transformer-rectifier output power supply VCCS-feedback adjustment module-millimeter wave isolation module-low-voltage side control module-inverter, which accurately monitors the circuit state of the high-voltage side, specifically the output voltage state of the high-voltage side.

[0040] In some specific embodiments, the power module further includes a first voltage stabilizer and a second voltage stabilizer, which are used for the low voltage side and the high voltage side, respectively, so as to perform voltage stabilization and filtering before powering each module to ensure the stability of the power supply voltage.

[0041] Specifically, the first voltage regulator LDO1 is located on the low-voltage side, and the second voltage regulator LDO2 is located on the high-voltage side; on the low-voltage side, the low-voltage side power supply voltage VCC1 is respectively connected to each power-consuming module on the low-voltage side through the first voltage regulator LDO1 to power it. The power-consuming modules on the low-voltage side include but are not limited to: a low-voltage side control module and a low-voltage side isolation circuit, etc. On the high-voltage side, the voltage VCCS outputted from the output end of the rectifier will be divided into two paths, one of which will be respectively connected to each power-consuming module on the high-voltage side through the second voltage regulator LDO2 to power it. Here, the power-consuming modules on the high-voltage side include but are not limited to: the high-voltage side control module, the high-voltage side isolation circuit and the feedback adjustment module, etc.; the other path is directly output to the feedback adjustment module for high-voltage side voltage monitoring.

[0042] In some specific implementations, the low-voltage side control module can be implemented by using the controller and Fault Monitoring modules; the high-voltage side control module can be implemented by using the gate driver and logic module; the feedback adjustment module can be implemented by using the feedback adjustment and error monitoring module Feedback and Fault Monitoring.

[0043] Combination Figure 1 It is understood that the working principle of the power supply circuit of the millimeter wave isolation driving circuit provided in this embodiment is as follows:

[0044] For the power supply line: the low-voltage side power supply voltage VCC1 is converted into AC voltage by the inverter, and then transmitted to the rectifier on the high-voltage side through the transformer; it is converted into a DC voltage VCCS after rectification and filtering by the rectifier and then output. This DC voltage VCCS has large ripple and noise, and can be stabilized and filtered by the second regulator LDO2 before supplying power to various power-consuming modules on the high-voltage side.

[0045] For the monitoring feedback regulation loop, Figure 1 The blue transmission line in the figure: while supplying power, in order to keep the output voltage of the inverter stable, a monitoring feedback regulation loop is specially set up to achieve accurate voltage feedback monitoring. Specifically, the inverter output voltage transmitted to the high-voltage side through the transformer, that is, the output voltage VCCS of the rectifier, will be directly transmitted to the feedback adjustment module and compared with the preset reference voltage to generate a control signal, which is then sent to the low-voltage side control module on the low-voltage side through the millimeter-wave isolation module in millimeter-wave transmission mode; the low-voltage side control module processes it, generates an ON / OFF signal to control the inverter switch, and sends it to the inverter; the ON / OFF signal can turn on / off the inverter, thereby controlling whether the inverter continues to oscillate and transmit energy to the high-voltage side, thereby controlling the voltage value of the VCCS output on the high-voltage side.

[0046] Combination Figure 1 It is understood that the working principle of the isolated transmission of the millimeter wave isolation driving circuit provided in this embodiment is as follows:

[0047] For the driving signal transmission line, that is, Figure 1 Green transmission line in the figure: After the drive signal IN is input to the low-voltage side control module on the low-voltage side, it is confirmed and processed by the low-voltage side control module, and then transmitted to the high-voltage side control module on the high-voltage side in a wireless millimeter-wave isolation manner, and converted into a drive signal OUT in the VCC2 voltage domain.

[0048] For the error feedback loop, Figure 1 The yellow transmission line in the figure: When the high-voltage side control module detects a circuit abnormality (such as overcurrent, overtemperature, short circuit, etc.), it generates an abnormal status signal Fault, which is then transmitted to the low-voltage side control module on the low-voltage side by the millimeter-wave isolation module in a wireless millimeter-wave isolation manner. The low-voltage side control module generates an input disable signal MUTE based on the abnormal status signal Fault to control the driver to stop transmitting the drive signal IN.

[0049] The millimeter wave isolation driving circuit provided in this embodiment has the following two significant features:

[0050] (1) Using millimeter wave isolated transmission, the bandwidth of isolated transmission can reach 1Mbps to 10Gbps, which is suitable for any scenario and has the advantage of fast isolated transmission speed; the millimeter wave carrier antenna is small and supports standard CMOS process or other standard packaging process for chip embedding, which has greater competitive advantages such as higher integration, smaller size, and lower cost; the millimeter wave wireless isolation method will not cause metal short circuit even if it is penetrated, and has higher isolation safety and isolation reliability.

[0051] (2) The optimized power supply design with power on the low-voltage side can not only reduce power consumption and optimize heat dissipation, but also strengthen loop control and more accurately monitor the power supply status on the high-voltage side, greatly broadening the application scenarios of the drive circuit.

[0052] Figure 2 A schematic diagram of the specific structure of a millimeter wave isolation drive circuit provided by an embodiment of the present invention.

[0053] This embodiment is based on Figure 1 The embodiment is further expanded and the millimeter wave isolation module therein is refined.

[0054] In this embodiment, the millimeter wave isolation module includes a low-voltage side isolation circuit and a high-voltage side isolation circuit; the low-voltage side isolation circuit is located on the low-voltage side, and the high-voltage side isolation circuit is located on the high-voltage side; the low-voltage side isolation circuit is connected to the low-voltage side control module, and the high-voltage side isolation circuit is connected to the high-voltage side control module, and the low-voltage side isolation circuit and the high-voltage side isolation circuit are connected wirelessly based on millimeter waves. In addition, the low-voltage side power supply (specifically through the first regulator LDO1) is also respectively connected to the low-voltage side control module and the low-voltage side isolation circuit to provide power for them; the output end of the rectifier (specifically through the second regulator LDO2) is also respectively connected to the high-voltage side isolation circuit and the feedback adjustment module to provide power for them.

[0055] like Figure 2 As shown, the low-voltage side isolation circuit in the millimeter wave isolation module specifically includes: a first transmitting unit TX1, a first transmitting antenna, a second receiving antenna and a second receiving unit RX2; the first transmitting unit TX1 is respectively connected to the driving signal output end of the low-voltage side control module and the first transmitting antenna; the second receiving unit RX2 is respectively connected to the feedback signal input end of the low-voltage side control module and the second receiving antenna. In addition, the power supply outputted by the low-voltage side power supply voltage VCC1 through the first regulator LDO1 is specifically connected to the first transmitting unit TX1 and the second receiving unit RX2 in the low-voltage side isolation circuit.

[0056] Correspondingly, the high-voltage side isolation circuit includes a first receiving antenna, a first receiving unit RX1, a second transmitting unit TX2 and a second transmitting antenna; the first receiving unit RX1 is respectively connected to the driving signal input end of the high-voltage side control module and the first receiving antenna; the second transmitting unit TX2 is respectively connected to the feedback signal output end of the feedback adjustment module and the second transmitting antenna. In addition, the power supply voltage VCCS output by the rectifier is specifically connected to the first receiving unit RX1 and the second transmitting unit TX2 in the high-voltage side isolation circuit through the power supply output by the second regulator LDO2.

[0057] In some specific implementations, the low-voltage side isolation circuit and the high-voltage side isolation circuit are integrated and packaged together in a millimeter wave isolation chip. That is, the millimeter wave isolation module is in the form of a millimeter wave isolation chip. It has the advantages of higher integration, smaller size and lower cost.

[0058] Combination Figure 2 It is understood that the working principle of the isolation transmission of the millimeter wave isolation module provided in this embodiment is as follows:

[0059] Isolated transmission of driving signals, i.e. Figure 2 The green transmission line in the figure: After the drive signal IN is input to the low-voltage side control module on the low-voltage side, it is confirmed and processed by the low-voltage side isolation circuit’s first transmitting unit TX1 for encoding and then transmitted through the first transmitting antenna in a wireless millimeter wave manner; after the first receiving antenna of the high-voltage side isolation circuit receives the drive signal, it is decoded by the first receiving unit RX1 and then transmitted to the high-voltage side control module, which converts it into a drive signal OUT in the VCC2 voltage domain.

[0060] Isolation transmission of the error feedback loop, i.e. Figure 2 The yellow transmission line in the figure: When the high-voltage side control module on the high-voltage side detects a circuit abnormality (such as overcurrent, overtemperature, short circuit, etc.), it generates an abnormal status signal Fault, which is then encoded by the second transmitting unit TX2 of the high-voltage side isolation circuit and transmitted through the second transmitting unit in a wireless millimeter wave manner; the second receiving antenna of the low-voltage side isolation circuit receives the signal and sends it to the second receiving unit RX2 for decoding, and then transmits it to the low-voltage side control module on the low-voltage side. The low-voltage side control module generates an input disable signal MUTE based on the abnormal status signal Fault to control the driver to stop transmitting the drive signal IN.

[0061] The VCCS monitors the isolated transmission of the feedback loop, i.e. Figure 2 The blue transmission line in the figure: the high-voltage side control module on the high-voltage side compares the voltage VCCS output by the rectifier with the preset reference voltage and generates a control signal; the control signal is encoded by the second transmitting unit TX2 of the high-voltage side isolation circuit and then transmitted by the second transmitting unit in a wireless millimeter wave manner; the second receiving antenna of the low-voltage side isolation circuit receives the signal and sends it to the second receiving unit RX2 for decoding, and then transmits it to the low-voltage side control module on the low-voltage side. The low-voltage side control module generates an ON / OFF signal for controlling the inverter switch according to the control signal and sends it to the inverter; the ON / OFF signal can turn on / off the inverter to control whether the inverter continues to oscillate and transmit energy to the high-voltage side, thereby controlling the voltage value of VCCS output by the high-voltage side.

[0062] Figure 3A schematic diagram of the circuit structure of an inverter to rectifier of a power supply circuit in a millimeter wave isolation drive circuit provided in an embodiment of the present invention. Figure 4 A schematic diagram of the principle of a monitoring feedback regulation loop in a millimeter wave isolation drive circuit provided by an embodiment of the present invention. Figure 5 A signal timing waveform diagram of a feedback loop in a millimeter wave isolation drive circuit provided in an embodiment of the present invention.

[0063] This embodiment is further expanded based on any of the above embodiments, and is further refined specifically with respect to its circuit power supply.

[0064] The inverter in the power supply circuit of this embodiment is as follows: Figure 3 As shown, a full-bridge inverter includes a lower inverter bridge, an upper inverter bridge and a control switch MT; the lower inverter bridge and the upper inverter bridge are two bridge arm structures of the full-bridge inverter. The low-voltage side control module is connected to the lower inverter bridge and the upper inverter bridge in sequence through the control switch MT; the connection line between the lower inverter bridge and the upper inverter bridge is connected to the primary coil Ls of the transformer.

[0065] Specifically, if Figure 3 As shown, the lower inverter bridge and the upper inverter bridge are mirror structures of each other, and both include two MOS transistors, two capacitors and two resistors. The upper inverter bridge includes MOS transistor MP1, MOS transistor MP2, resistor R1, resistor R2, capacitor C1 and capacitor C2; the lower inverter bridge includes MOS transistor MN1, MOS transistor MN2, resistor R3, resistor R4, capacitor C3 and capacitor C4. The gate of the MOS transistor MP1 of the upper inverter bridge and the gate of the MOS transistor MP2 are connected through the resistor R1 and the resistor R2 connected in series. In addition, the gate of the MOS transistor MP1 is also connected to the drain of the MOS transistor MP2 through the capacitor C2; the gate of the MOS transistor MP2 is also connected to the drain of the MOS transistor MP1 through the capacitor C1; and the source of the MOS transistor MP1 and the source of the MOS transistor MP2 are connected and then connected to the low-voltage side power supply VCC1. Correspondingly, the gate of the MOS transistor MN1 of the lower inverter bridge is connected to the gate of the MOS transistor MN2 through a resistor R3 and a resistor R4 connected in series. In addition, the gate of the MOS transistor MN1 is also connected to the drain of the MOS transistor MN2 through a capacitor C4; the gate of the MOS transistor MN2 is also connected to the drain of the MOS transistor MN1 through a capacitor C3; and the source of the MOS transistor MN1 and the source of the MOS transistor MN2 are connected to the control switch MT.

[0066] In some specific implementations, the two MOS transistors in the lower inverter bridge are both N-channel MOS transistors; and the two MOS transistors in the upper inverter bridge are both P-channel MOS transistors.

[0067] In some specific implementations, the control switch MT is a MOS transistor, a gate of which is connected to the low-voltage side control module, a source of which is grounded, and a drain of which is connected to the source of the MOS transistor MN1 and the source of the MOS transistor MN2.

[0068] In the above inverter, the bias voltage VBP between the resistor R1 and the resistor R2 in the upper inverter bridge, the bias voltage VBN between the resistor R3 and the resistor R4 in the lower inverter bridge, the capacitors C1 to C4, and the resistors R1 to R4 can change the bias conditions of the four power MOSs, thereby adjusting the oscillation performance of the inverter.

[0069] The rectifier in the power supply circuit of this embodiment, such as Figure 3 As shown, it includes a rectifier tube D1, a rectifier tube D2, a rectifier tube D3, a rectifier tube D4 and a capacitor C5.

[0070] Specifically, the rectifier tube D1 and the rectifier tube D3 are connected in series in the same direction, that is, the anode of the rectifier tube D1 is connected to the cathode of the rectifier tube D3; the rectifier tube D2 and the rectifier tube D4 are connected in series in the same direction, that is, the anode of the rectifier tube D2 is connected to the cathode of the rectifier tube D4; one end of the secondary coil Lp is connected to the connecting line between the rectifier tube D1 and the rectifier tube D3, that is, the anode of the rectifier tube D1, and the other end is connected to the connecting line between the rectifier tube D2 and the rectifier tube D4, that is, The anode of the rectifier D2; the rectifier D1 and the rectifier D3, the rectifier D2 and the rectifier D4 and the capacitor C5 connected in series are connected in parallel, one end of which is grounded, and the other end serves as the output end VCCS of the rectifier, that is, the cathode of the rectifier D1, the cathode of the rectifier D2 and one end of the capacitor C5 are connected as the voltage output end VCCS of the secondary coil, and the anode of the rectifier D3, the anode of the rectifier D4 and the other end of the capacitor C5 are connected.

[0071] The working principle of the inverter-transformer-rectifier in the power module described above in this embodiment is:

[0072] The inverter is powered by the low-voltage side power supply VCC1; when the ON / OFF signal output by the low-voltage side control module is high, the control switch MT will be connected, and the current will flow through the primary coil Ls of the transformer; at the same time, the two cross-coupled MOS tubes in the lower inverter bridge and the upper inverter bridge will be designed to make the entire circuit meet the oscillation conditions. When there is current in the primary coil Ls, the VP1 and VP2 generated by the oscillation of the lower inverter bridge and the upper inverter bridge will be converted into AC voltage and transmitted to the secondary coil Lp through the primary coil Ls. The secondary coil Lp outputs the AC power to the rectifier bridge composed of rectifier tubes D1 to D4 for rectification, and then passes through the capacitor C5 for filtering and voltage stabilization to obtain a relatively stable VCCS power supply voltage.

[0073] As can be seen from the above, the inverter-transformer-rectifier circuit structure in the power module provided in this embodiment, when set in the isolation drive circuit, can achieve the effect of powering up from the low-voltage side and continuously and stably supplying power to the high-voltage side. At the same time, the circuit structure of the power module of this embodiment also has the advantages of being simple, practical and easy to implement.

[0074] In addition, it can be understood that if the control switch MT located in the inverter in the above-mentioned power module is always in the on state, that is, the inverter is always in the oscillation state; then, the secondary coil Lp on the high-voltage side of the transformer will always receive electrical energy, and the capacitor C5 in the rectifier will always be in a state of continuous charging, thereby causing the output voltage VCCS of the rectifier to continue to rise. This will cause power waste and the working conditions are not stable enough. In this regard, the embodiment of the present invention also introduces a monitoring feedback regulation loop to dynamically adjust the output voltage VCCS of the rectifier, ensure the stability of the power supply voltage on the high-voltage side, and prevent power waste.

[0075] In the following, the monitoring feedback regulation loop used to dynamically adjust the VCCS and the error feedback loop used to implement abnormal error feedback are collectively referred to as the feedback loop of the driving circuit. Figure 4 Understand that the working principle of the feedback loop is:

[0076] There are two signals that the drive circuit needs to feed back to the low-voltage side: the abnormal state signal Fault of the drive circuit (such as overcurrent, overtemperature and short circuit, etc.) and the deviation signal of the voltage VCCS at the output end of the rectifier compared to the reference voltage VREF. After the two feedback signals are encoded by the encoder Encoder to generate the Code signal, they are handed over to the second transmitting unit TX2 of the millimeter wave isolation module to control the second transmitting antenna for transmission; after the second receiving unit RX2 receives it through the second receiving antenna, it is handed over to the decoder Decoder for decoding to generate the corresponding input disable signal MUTE or the signal ON / OFF to control the inverter switch, so as to control whether the drive circuit transmits the drive signal IN or whether the inverter on the low-voltage side of the power supply circuit continues to oscillate and transmit energy to the high-voltage side.

[0077] like Figure 5 As shown, the timing waveforms of the signals in the feedback loop of the above-mentioned drive circuit, in the time period from t0 to t5, when the abnormal state signal Fault is detected to be valid, an error occurs; and in the time period from t2 to t5, the voltage VCCS at the output end of the rectifier exceeds the reference voltage VREF, the energy is excessive, and the inverter needs to be shut down.

[0078] The encoder has an encoding period of Ten. When the rising edge of the clock arrives, the timing encoding is performed according to the current state:

[0079] No pulses in the cycle represent no error (i.e., no abnormal state signal Fault is detected) and the voltage VCCS is lower than the reference voltage VREF;

[0080] One pulse, indicating that no error occurs and the voltage VCCS is higher than the reference voltage VREF;

[0081] Two pulses, representing an error occurrence and the voltage VCCS being lower than the reference voltage VREF;

[0082] Three pulses, indicating an error has occurred and the VCCS voltage is higher than a predetermined value.

[0083] Due to the timing transmission characteristics, the ON / OFF signal and the input disable signal MUTE will lag behind by one cycle plus the channel delay.

[0084] An embodiment of the present invention further provides an electronic device, comprising the millimeter wave isolation driving circuit described in any of the above embodiments.

[0085] Here, the specific content of the millimeter wave isolation driving circuit will not be repeated. For details, please refer to the description of the above embodiments.

[0086] The electronic device described in this embodiment can be any electronic device with isolation drive requirements, such as power supply equipment, motor drive equipment, handheld equipment, etc., such as a car charging pile and LED driver.

[0087] The electronic device provided in this embodiment, in which the millimeter wave isolation drive circuit used for isolation drive, adopts the millimeter wave wireless method to perform isolation transmission between the high and low voltage sides, and therefore has all the advantages of millimeter wave technology, including but not limited to: fast isolation transmission speed, higher integration, smaller size and lower cost, higher isolation safety and isolation reliability, etc. More importantly, the drive circuit optimizes the power-on method, and adopts an optimized power supply design for powering on the low voltage side, which can not only reduce power consumption and optimize heat dissipation; but also strengthen loop control and more accurately monitor the power supply status of the high voltage side, making the power supply of the electronic device more stable. As a result, the electronic device of this embodiment can make its isolation drive performance more stable, safe and reliable, and can also be significantly improved in isolation transmission speed.

[0088] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0093] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0095] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0096] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0097] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0098] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0099] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A millimeter wave isolation driving circuit, characterized in that: It includes a low-voltage side control module located on the low-voltage side, a high-voltage side control module located on the high-voltage side, and a millimeter wave isolation module; the low-voltage side control module is connected to the high-voltage side control module through the millimeter wave isolation module; It also includes a power supply circuit; the power supply circuit includes an inverter, a transformer, a rectifier and a feedback adjustment module connected in sequence; the primary coils of the inverter and the transformer are located on the low-voltage side; the input end of the inverter is connected to the low-voltage side power supply; the secondary coil of the transformer, the rectifier and the feedback adjustment module are located on the high-voltage side; the output end of the rectifier is also connected to the high-voltage side control module; the output end of the feedback adjustment module is connected to the low-voltage side control module through the millimeter wave isolation module; the low-voltage side control module is also connected to the inverter.

2. A millimeter wave isolation driving circuit as claimed in claim 1, characterized in that: The millimeter wave isolation module includes a low-voltage side isolation circuit and a high-voltage side isolation circuit; the low-voltage side isolation circuit is located on the low-voltage side, and the high-voltage side isolation circuit is located on the high-voltage side; the low-voltage side isolation circuit is connected to the low-voltage side control module, and the high-voltage side isolation circuit is connected to the high-voltage side control module, and the low-voltage side isolation circuit and the high-voltage side isolation circuit are wirelessly connected based on millimeter waves.

3. A millimeter wave isolation driving circuit as claimed in claim 2, characterized in that: The low-voltage side power supply is also connected to the low-voltage side control module and the low-voltage side isolation circuit respectively; the output end of the rectifier is also connected to the high-voltage side isolation circuit and the feedback adjustment module respectively.

4. A millimeter wave isolation driving circuit as claimed in claim 3, characterized in that: The power supply module also includes a first voltage stabilizer and a second voltage stabilizer; the first voltage stabilizer is located on the low-voltage side, and the second voltage stabilizer is located on the high-voltage side; the low-voltage side power supply is respectively connected to the low-voltage side control module and the low-voltage side isolation circuit through the first voltage stabilizer; the output end of the rectifier is divided into two paths, one path is respectively connected to the high-voltage side control module, the high-voltage side isolation circuit and the feedback adjustment module through the second voltage stabilizer; the other path is directly connected to the feedback adjustment module.

5. A millimeter wave isolation driving circuit as claimed in claim 2, characterized in that: The low-voltage side isolation circuit includes a first transmitting unit, a first transmitting antenna, a second receiving antenna and a second receiving unit; the first transmitting unit is respectively connected to the driving signal output end of the low-voltage side control module and the first transmitting antenna; the second receiving unit is respectively connected to the feedback signal input end of the low-voltage side control module and the second receiving antenna; The high-voltage side isolation circuit includes a first receiving antenna, a first receiving unit, a second transmitting unit and a second transmitting antenna; the first receiving unit is respectively connected to the driving signal input end of the high-voltage side control module and the first receiving antenna; the second transmitting unit is respectively connected to the feedback signal output end of the feedback adjustment module and the second transmitting antenna.

6. A millimeter wave isolation driving circuit as claimed in claim 1, characterized in that: The inverter includes a lower inverter bridge, an upper inverter bridge and a control switch; the low-voltage side control module is connected to the lower inverter bridge and the upper inverter bridge connected in sequence through the control switch; and the connecting line between the lower inverter bridge and the upper inverter bridge is connected to the primary coil.

7. A millimeter wave isolation driving circuit as claimed in claim 6, characterized in that: The lower inverter bridge and the upper inverter bridge are mirror images of each other, and each includes two MOS tubes, two capacitors and two resistors; the two resistors connected in series are connected between the gates of the two MOS tubes; the gates of the two MOS tubes are also connected to the drain of the corresponding other MOS tube through a capacitor; the sources of the two MOS tubes are connected; The drains of the two MOS tubes in the lower inverter bridge are respectively connected to the drains of the two MOS tubes in the upper inverter bridge; the drains of the two MOS tubes in the lower inverter bridge are also respectively connected to the two ends of the primary coil; the sources of the two MOS tubes in the upper inverter bridge are connected to the low-voltage side power supply; the sources of the two MOS tubes in the lower inverter bridge are connected to the control switch.

8. A millimeter wave isolation driving circuit as claimed in claim 7, characterized in that: The two MOS tubes in the lower inverter bridge are both N-channel MOS tubes; the two MOS tubes in the upper inverter bridge are both P-channel MOS tubes.

9. A millimeter wave isolation driving circuit as claimed in claim 1, characterized in that: The rectifier includes a rectifier tube D1, a rectifier tube D2, a rectifier tube D3, a rectifier tube D4 and a capacitor C5; The rectifier tube D1 and the rectifier tube D3 are connected in series in the same direction; the rectifier tube D2 and the rectifier tube D4 are connected in series in the same direction; one end of the secondary coil is connected to the connecting line between the rectifier tube D1 and the rectifier tube D3, and the other end thereof is connected to the connecting line between the rectifier tube D2 and the rectifier tube D4; after the rectifier tube D1 and the rectifier tube D3 connected in series, the rectifier tube D2 and the rectifier tube D4 connected in series, and the capacitor C5 are connected in parallel, one end is grounded, and the other end serves as the output end of the rectifier.

10. An electronic device, characterized in that: The invention comprises the millimeter wave isolation driving circuit as described in any one of claims 1 to 9.

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