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JP-2026074563-A - Signal transmission devices, isolation switches, electronic equipment, vehicles

JP2026074563AJP 2026074563 AJP2026074563 AJP 2026074563AJP-2026074563-A

Abstract

[Problem] Reduce the number of elements and power consumption of the signal transmission device. [Solution] The signal transmission device 650 includes a transmitting circuit 611 that generates transmitting signals I11 and I12 in accordance with an input signal DIN, a receiving circuit 621 that generates an output signal GO in accordance with received signals I21 and I22, and transformers 631 and 632 that transmit the transmitting signals I11 and I12 as received signals I21 and I22, respectively, while insulating the transmitting circuit 611 and the receiving circuit 621. The receiving circuit 621 includes a transistor N21 connected between the application terminal of the output signal GO and the application terminal of the reference signal SI to discharge the output signal GO, and a driving circuit DRV connected between the application terminal of the output signal GO and the application terminal of the reference signal SI to drive the transistor N21 in accordance with at least one of the received signals I21 and I22. [Selection Diagram] Figure 12

Inventors

  • 齊藤 弘治
  • 村松 聖倭

Assignees

  • ローム株式会社

Dates

Publication Date
20260507
Application Date
20241021

Claims (11)

  1. A transmission circuit configured to generate a first transmission signal and a second transmission signal in response to an input signal, A receiving circuit configured to generate an output signal in response to a first received signal and a second received signal, A first transformer configured to transmit the first transmission signal as a first reception signal while insulating the transmission circuit from the receiving circuit, A second transformer configured to transmit the second transmission signal as the second reception signal while insulating the transmission circuit from the transmission circuit and the reception circuit, Equipped with, The receiving circuit is, A first transistor is connected between the application terminal of the output signal and the application terminal of the reference signal and configured to discharge the output signal, A drive circuit connected between the application terminal of the output signal and the application terminal of the reference signal, configured to drive the first transistor in accordance with at least one of the first received signal and the second received signal, A signal transmission device equipped with the following features.
  2. The aforementioned drive circuit is A time constant circuit configured to generate a first drive signal for the first transistor from the output signal, A second transistor is connected between the control terminal of the first transistor and the application terminal of the reference signal and is configured to be driven in accordance with at least one of the first received signal and the second received signal, The signal transmission device according to claim 1, including the following:
  3. The signal transmission device according to claim 2, wherein the drive circuit includes a diode configured to be connected between the application terminal of the output signal and the control terminal of the first transistor.
  4. The signal transmission device according to claim 2, wherein the drive circuit includes a rectifier circuit configured to rectify at least one of the first received signal and the second received signal to generate a second drive signal for the second transistor.
  5. The signal transmission device according to claim 1, wherein the receiving circuit includes a plurality of boost circuits connected in series between the application terminal of the first received signal and the application terminal of the output signal.
  6. In the aforementioned multi-stage boost circuit, each odd-numbered boost circuit includes a first diode connected between the application terminal of the first received signal and the application terminal of the output signal such that the direction in which the first received signal flows is forward, and a first capacitor connected between the cathode of the first diode and the application terminal of the second received signal. The signal transmission device according to claim 5, wherein, among the multiple boost circuits, the even-numbered boost circuits each include a second diode connected between the application terminal of the first received signal and the application terminal of the output signal such that the direction in which the first received signal flows is forward, and a second capacitor connected between the cathode of the second diode and the application terminal of the first received signal.
  7. The signal transmission device according to claim 1, wherein the transmitting circuit performs pulse driving of the first and second transmitting signals when the input signal is at a first logic level, and stops the pulse driving of the first and second transmitting signals when the input signal is at a second logic level.
  8. The signal transmission device according to claim 1, wherein the primary coil of the first transformer and the primary coil of the second transformer are connected in series with their respective winding directions being opposite.
  9. A signal transmission device according to any one of claims 1 to 8, A switch circuit configured to be driven according to the output signal, An insulated switch equipped with this feature.
  10. The insulating switch according to claim 9, A load configured to be connected to the aforementioned isolation switch, An electronic device equipped with the following features.
  11. A vehicle equipped with the electronic device described in claim 10.

Description

This disclosure relates to signal transmission devices, isolation switches, electronic equipment, and vehicles. Conventionally, signal transmission devices that electrically isolate primary and secondary circuit systems while transmitting signals between them have been used in various applications (such as power supply units or motor drive units). Furthermore, an example of prior art related to the above is Patent Document 1 by the present applicant. International Publication No. 2022/070944 [overview] Conventional signal transmission devices had room for improvement in their signal transmission methods. For example, the signal transmission device according to this disclosure comprises: a transmission circuit configured to generate a first transmission signal and a second transmission signal in response to an input signal; a reception circuit configured to generate an output signal in response to a first reception signal and a second reception signal; a first transformer configured to transmit the first transmission signal as the first reception signal while insulating the transmission circuit from the reception circuit; and a second transformer configured to transmit the second transmission signal as the second reception signal while insulating the transmission circuit from the reception circuit. The reception circuit further comprises: a first transistor connected between the application terminal of the output signal and the application terminal of the reference signal to discharge the output signal; and a drive circuit connected between the application terminal of the output signal and the application terminal of the reference signal to drive the first transistor in response to at least one of the first reception signal and the second reception signal. Figure 1 shows the basic configuration of a signal transmission device.Figure 2 shows the basic structure of a transformer chip.Figure 3 is a perspective view of a semiconductor device used as a two-channel transformer chip.Figure 4 is a plan view of the semiconductor device shown in Figure 3.Figure 5 is a plan view showing the layer in the semiconductor device of Figure 3 where the low-potential coil is formed.Figure 6 is a plan view showing the layer in the semiconductor device of Figure 3 where the high-potential coil is formed.Figure 7 is a cross-sectional view along the line VIII-VIII shown in Figure 6.Figure 8 shows an enlarged view (separated structure) of region XIII shown in Figure 7.Figure 9 is a schematic diagram showing an example of a transformer chip layout.Figure 10 shows a first embodiment of an insulating switch.Figure 11 shows the signal transmission operation of the first embodiment.Figure 12 shows a second embodiment of the insulated switch.Figure 13 shows the signal transmission operation of the second embodiment.Figure 14 shows the ON operation of the second embodiment.Figure 15 shows the off operation of the second embodiment.Figure 16 shows a third embodiment of the insulated switch.Figure 17 shows a fourth embodiment of the insulated switch.Figure 18 shows the OFF operation of the fourth embodiment.Figure 19 shows a fifth embodiment of the insulated switch.Figure 20 shows the ON operation of the fifth embodiment.Figure 21 shows a sixth embodiment of the insulated switch.Figure 22 shows a seventh embodiment of the insulated switch.Figure 23 shows the exterior of the vehicle. [Detailed explanation] <Signal transmission device (basic configuration)> Figure 1 shows the basic configuration of a signal transmission device. The signal transmission device 200 in this example configuration is a semiconductor integrated circuit device (a so-called isolated gate driver IC) that transmits pulse signals from the primary circuit system 200p to the secondary circuit system 200s while insulating the primary circuit system 200p (VCC1-GND1 system) and the secondary circuit system 200s (VCC2-GND2 system), and drives the gate of a switch element (not shown) provided in the secondary circuit system 200s. For example, the signal transmission device 200 consists of a controller chip 210, a driver chip 220, and a transformer chip 230, all sealed in a single package. The controller chip 210 is a semiconductor chip that operates on a power supply voltage VCC1 (for example, a maximum of 7V relative to GND1). The controller chip 210 integrates, for example, a pulse transmission circuit 211 and buffers 212 and 213. The pulse transmission circuit 211 is a pulse generator that generates transmission pulse signals S11 and S21 in response to the input pulse signal IN. More specifically, when the pulse transmission circuit 211 indicates that the input pulse signal IN is high level, it performs pulse driving of transmission pulse signal S11 (single or multiple transmission pulse outputs), and when it indicates that the input pulse signal IN is low level, it performs pulse driving of transmission pulse signal S21. In other words, the pulse transmission circuit 211 pu