Vehicle remote input and output module power supply device and oscillation conversion circuit

Abstract

The invention relates to a vehicle remote input and output module power supply device and an oscillation conversion circuit, and the oscillation conversion circuit in an RIOM T215 power supply board is improved, and the oscillation conversion circuit comprises an isolated gate driver, a first field effect transistor, a second field effect transistor, a diode, a first capacitor and a timing unit. The withstand voltage of the first field effect transistor and the second field effect transistor is two times larger than the output voltage of the BOOST circuit, the drain electrode of the first field effect transistor is connected to the output end of the BOOST circuit, and the source electrode of the first field effect transistor is connected to the input end of the rectification filter circuit and the drain electrode of the second field effect transistor. The grid electrode of the first field effect transistor is connected to the high-side grid driver output pin of the isolated grid driver, and the source electrode of the second field effect transistor is grounded. Compared with the prior art, the device has the advantages of long service life, low failure rate and the like.

Description

Technical Field

[0001] The invention relates to the field of subway train power board maintenance, and in particular to a vehicle remote input and output module power supply device and an oscillation conversion circuit. Background Art

[0002] The main function of the rail transit vehicle remote input and output module ROIM T215 is similar to that of an intelligent transceiver, which collects information from various vehicle systems (including traction, braking, doors, etc.), and forwards the information to the main control unit of the train information management system (MPU) after processing. The RIOM T215 module consists of a power board and 6 functional circuit boards, which are connected by pins and cables to form the entire module.

[0003] During the maintenance of subway trains, it was found that the failure of the vehicle remote input and output module ROIM T215 mainly occurred in the power board part, and showed certain characteristics of planned scrapping. The effective normal working time of the entire board was significantly shorter than the life of each component, and the specific cause could not be found. The only option was to replace the entire board, which increased costs. Summary of the invention

[0004] The purpose of the present invention is to provide a vehicle remote input and output module power supply device and an oscillation conversion circuit.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A vehicle remote input and output module RIOM T215 power supply device comprises a filter circuit, a BOOST boost circuit, an oscillation conversion circuit, a rectifier filter circuit, a start-up circuit and a PWM drive circuit, wherein the input end of the filter circuit is connected to a 110V DC power supply, and the filter circuit, the BOOST boost circuit, the oscillation conversion circuit and the rectifier filter circuit are connected in sequence, the input end of the start-up circuit is connected to the 110V DC power supply output end and is connected to the oscillation conversion circuit through a PWM drive circuit, the oscillation conversion circuit comprises an isolated gate driver, a first field effect tube, a second field effect tube, a diode, a first capacitor and a timing unit, the withstand voltage of the first field effect tube and the second field effect tube is greater than twice the output voltage of the BOOST boost circuit,

[0007] The drain of the first field effect tube is connected to the output end of the BOOST boost circuit, the source is connected to the input end of the rectifier filter circuit and the drain of the second field effect tube, and the gate of the first field effect tube is connected to the high-side gate driver output pin of the isolated gate driver.

[0008] The source of the second field effect transistor is grounded, and the gate is connected to the low-side gate driver output pin of the isolated gate driver.

[0009] The power input pin of the isolated gate driver is connected to the anode of the diode, and is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface, the floating power pin is connected to the cathode of the diode and one end of the first capacitor, the timing capacitor pin and the timing resistor pin are connected to the timing unit, and the high-voltage floating power loop pin is connected to the other end of the first capacitor and is grounded.

[0010] The oscillation conversion circuit also includes a step-down resistor, which is arranged between the power input pin and the power input interface of the isolated gate driver, and one end of the step-down resistor is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface, and the other end is connected to the power input pin of the isolated gate driver and the positive electrode of the diode.

[0011] A first resistor is arranged between the high-side gate driver output pin of the isolated gate driver and the gate of the first field effect transistor.

[0012] A second resistor is provided between the low-side gate driver output pin of the isolated gate driver and the gate of the second field effect transistor.

[0013] The timing unit includes a second capacitor and a fifth resistor, one end of the second capacitor is grounded, and the other end is connected to a timing resistor pin of the isolated gate driver.

[0014] The timing unit also includes a third capacitor, a fourth resistor and an LCR oscillation element, one end of the third capacitor is grounded, and the other end is connected to one end of the LCR oscillation element, the other end of the LCR oscillation element is connected to the timing capacitor pin of the isolated gate driver, and the fourth resistor is connected in parallel to both ends of the third capacitor.

[0015] The timing unit further includes a fifth resistor, which is connected in series between the second capacitor and a timing resistor pin of the isolated gate driver.

[0016] The oscillation conversion circuit also includes a grounding capacitor and a grounding inductor, and the high-voltage floating power supply loop of the isolated gate driver is grounded through the grounding capacitor and the grounding inductor in sequence.

[0017] The isolated gate driver adopts IR2153D.

[0018] An oscillation conversion circuit includes an isolated gate driver, a first field effect transistor, a second field effect transistor, a diode, a first capacitor and a timing unit.

[0019] The drain of the first field effect transistor is connected to the output end of the high voltage DC source, the source is connected to the input end of the rectifier filter circuit and the drain of the second field effect transistor, and the gate of the first field effect transistor is connected to the high side gate driver output pin of the isolated gate driver.

[0020] The source of the second field effect transistor is grounded, and the gate is connected to the low-side gate driver output pin of the isolated gate driver.

[0021] The power input pin of the isolated gate driver is connected to the anode of the diode and is connected to the output end of the low-voltage DC source through the power input interface, the floating power pin is connected to the cathode of the diode and one end of the first capacitor, the timing capacitor pin and the timing resistor pin are connected to the timing unit, and the high-voltage floating power loop pin is connected to the other end of the first capacitor and is grounded;

[0022] The withstand voltage of the first field effect tube and the second field effect tube is greater than twice the voltage of the high voltage DC source.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By increasing the withstand voltage level of the first field effect transistor and the second field effect transistor, and based on the pin connection of the isolated gate driver, the input of its power input pin is isolated from the high voltage input, thereby improving the stability under high voltage and high frequency conditions, thereby reducing the failure rate and extending the service life.

[0025] 2. A voltage drop resistor is set on the power input pin side to improve safety.

[0026] 3. Use independent timing capacitor and timing resistor branches to reduce interference between the two and improve the quality of the oscillation output waveform. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the RIOM T215 power board;

[0028] Figure 2 is a circuit diagram of an oscillation conversion circuit;

[0029] Among them: R1, the first resistor, R2, the second resistor, R3, the step-down resistor, R4, the fourth resistor, C1, the first capacitor, C2, the second capacitor, C3, the third capacitor, C4, the grounding capacitor, L1, the grounding inductor, U1, the isolated gate driver, U2, the LCR oscillation element, D1, the diode, Q1, the first field effect transistor, Q2, the second field effect transistor. DETAILED DESCRIPTION

[0030] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0031] A vehicle remote input and output module power supply device, specifically, the whole is similar to the RIOM T215 power supply board. The function of the RIOM T215 power supply board is to convert the train DC110V voltage into DC15V and DC5V, wherein the DC15V is output to the UCR board and PC104MVB board, PXA255 clamp board, 4X485SLPER board for use, and the DC15V direct current is directly output to the AES board for use. Its structure is as follows Figure 1 As shown, it includes a filtering circuit, a BOOST boost circuit, an oscillation conversion circuit, a rectifier filtering circuit, a starting circuit and a PWM drive circuit. The input end of the filtering circuit is connected to a 110V DC power supply, and the filtering circuit, the BOOST boost circuit, the oscillation conversion circuit and the rectifier filtering circuit are connected in sequence. The input end of the starting circuit is connected to the 110V DC power supply output end and is connected to the oscillation conversion circuit through the PWM drive circuit.

[0032] The improvements made in this application are mainly in the oscillation conversion circuit part, specifically, Figure 2 As shown, the oscillation conversion circuit includes an isolated gate driver U1, a first field effect transistor Q1, a second field effect transistor Q2, a diode D1, a first capacitor C1 and a timing unit. The withstand voltage of the first field effect transistor Q1 and the second field effect transistor Q2 is greater than twice the output voltage of the BOOST boost circuit.

[0033] The drain of the first field effect transistor Q1 is connected to the output end of the BOOST boost circuit, the source is connected to the input end of the rectifier filter circuit and the drain of the second field effect transistor Q2, and the gate of the first field effect transistor Q1 is connected to the high-side gate driver output pin of the isolated gate driver U1.

[0034] The source of the second FET Q2 is grounded, and the gate is connected to the low-side gate driver output pin of the isolated gate driver U1.

[0035] The power input pin of the isolated gate driver U1 is connected to the positive electrode of the diode D1, and is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface. The floating power pin is connected to the negative electrode of the diode D1 and one end of the first capacitor C1. The timing capacitor pin and the timing resistor pin are connected to the timing unit. The high-voltage floating power loop pin is connected to the other end of the first capacitor C1 and is grounded.

[0036] After the DC110V is powered on, a starting voltage circuit is required to generate an instantaneous 15V DC voltage for the isolated gate driver U1. The BOOST boost circuit boosts the DC110V to DC160V, which is then converted to a DC 15V output by the rectifier and filter circuit after oscillation and inversion by the oscillation conversion circuit. When the power board outputs DC 15V normally, it can continuously power the isolated gate driver U1.

[0037] In the present application, by increasing the withstand voltage level of the first field effect transistor Q1 and the second field effect transistor Q2, and based on the pin connection of the isolated gate driver U1, the input of its power input pin is isolated from the high voltage input, thereby improving the stability under high voltage and high frequency conditions, thereby reducing the failure rate and extending the life.

[0038] In addition, in most embodiments, the oscillation conversion circuit also includes a step-down resistor R3, which is arranged between the power input pin and the power input interface of the isolated gate driver U1, and one end of the step-down resistor R3 is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface, and the other end is connected to the power input pin of the isolated gate driver U1 and the positive electrode of the diode D1, thereby improving safety.

[0039] Furthermore, in most embodiments, a first resistor R1 is provided between the high-side gate driver output pin of the isolated gate driver U1 and the gate of the first field effect transistor Q1. Similarly, a second resistor R2 is provided between the low-side gate driver output pin of the isolated gate driver U1 and the gate of the second field effect transistor Q2, thereby improving safety.

[0040] In addition, in most embodiments, the timing unit includes a second capacitor C2 and a fifth resistor, one end of the second capacitor C2 is grounded, and the other end is connected to the timing resistor pin of the isolated gate driver U1. And, the timing unit also includes a third capacitor C3, a fourth resistor R4 and an LCR oscillator element U2, one end of the third capacitor C3 is grounded, and the other end is connected to one end of the LCR oscillator element U2, the other end of the LCR oscillator element U2 is connected to the timing capacitor pin of the isolated gate driver U1, and the fourth resistor R4 is connected in parallel to both ends of the third capacitor C3. Independent timing capacitor and timing resistor branches are used to reduce interference between the two and improve the quality of the oscillation output waveform.

[0041] In this embodiment, the timing unit further includes a fifth resistor, which is connected in series between the second capacitor C2 and the timing resistor pin of the isolated gate driver U1.

[0042] Generally, the oscillation conversion circuit further includes a grounding capacitor C4 and a grounding inductor L1, and the high-voltage floating power supply loop of the isolated gate driver U1 is grounded through the grounding capacitor C4 and the grounding inductor L1 in sequence.

[0043] In addition, specifically, in this embodiment, the isolated gate driver U1 adopts IR2153D, and the first field effect tube Q1 and the second field effect tube Q2 both adopt AOD9N40D. After a long period of demonstration and research, it is found that the use of AOD9N40D MOS tubes will not change the withstand voltage, current, and junction capacitance in a high-voltage working environment, thereby improving the stability of the output of the oscillation circuit, thereby reducing the failure of the RIOM T215 power module.

Claims

1. A vehicle remote input and output module power supply device, comprising a filter circuit, a BOOST boost circuit, an oscillation conversion circuit, a rectifier filter circuit, a start-up circuit and a PWM drive circuit, wherein the input end of the filter circuit is connected to a 110V DC power supply, and the filter circuit, the BOOST boost circuit, the oscillation conversion circuit and the rectifier filter circuit are connected in sequence, the input end of the start-up circuit is connected to the 110V DC power supply output end and is connected to the oscillation conversion circuit through a PWM drive circuit, characterized in that: The oscillation conversion circuit includes an isolated gate driver, a first field effect transistor, a second field effect transistor, a diode, a first capacitor and a timing unit. The withstand voltage of the first field effect transistor and the second field effect transistor is greater than twice the output voltage of the BOOST boost circuit. The drain of the first field effect tube is connected to the output end of the BOOST boost circuit, the source is connected to the input end of the rectifier filter circuit and the drain of the second field effect tube, and the gate of the first field effect tube is connected to the high-side gate driver output pin of the isolated gate driver. The source of the second field effect transistor is grounded, and the gate is connected to the low-side gate driver output pin of the isolated gate driver. The power input pin of the isolated gate driver is connected to the anode of the diode, and is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface, the floating power pin is connected to the cathode of the diode and one end of the first capacitor, the timing capacitor pin and the timing resistor pin are connected to the timing unit, and the high-voltage floating power loop pin is connected to the other end of the first capacitor and is grounded.

2. A vehicle remote input and output module power supply device according to claim 1, characterized in that: The oscillation conversion circuit also includes a step-down resistor, which is arranged between the power input pin and the power input interface of the isolated gate driver, and one end of the step-down resistor is connected to the output end of the PWM drive circuit and the output end of the filter circuit through the power input interface, and the other end is connected to the power input pin of the isolated gate driver and the positive electrode of the diode.

3. A vehicle remote input and output module power supply device according to claim 1, characterized in that: A first resistor is arranged between the high-side gate driver output pin of the isolated gate driver and the gate of the first field effect transistor.

4. A vehicle remote input and output module power supply device according to claim 1, characterized in that: A second resistor is provided between the low-side gate driver output pin of the isolated gate driver and the gate of the second field effect transistor.

5. A vehicle remote input and output module power supply device according to claim 1, characterized in that: The timing unit includes a second capacitor and a fifth resistor, one end of the second capacitor is grounded, and the other end is connected to a timing resistor pin of the isolated gate driver.

6. A vehicle remote input and output module power supply device according to claim 5, characterized in that: The timing unit also includes a third capacitor, a fourth resistor and an LCR oscillation element, one end of the third capacitor is grounded, and the other end is connected to one end of the LCR oscillation element, the other end of the LCR oscillation element is connected to the timing capacitor pin of the isolated gate driver, and the fourth resistor is connected in parallel to both ends of the third capacitor.

7. A vehicle remote input and output module power supply device according to claim 5, characterized in that: The timing unit further includes a fifth resistor, which is connected in series between the second capacitor and a timing resistor pin of the isolated gate driver.

8. A vehicle remote input and output module power supply device according to claim 1, characterized in that: The oscillation conversion circuit also includes a grounding capacitor and a grounding inductor, and the high-voltage floating power supply loop of the isolated gate driver is grounded through the grounding capacitor and the grounding inductor in sequence.

9. A vehicle remote input and output module power supply device according to claim 1, characterized in that: The isolated gate driver adopts IR2153D.

10. An oscillation conversion circuit, characterized in that: The invention comprises an isolated gate driver, a first field effect transistor, a second field effect transistor, a diode, a first capacitor and a timing unit. The drain of the first field effect transistor is connected to the output end of the high voltage DC source, the source is connected to the input end of the rectifier filter circuit and the drain of the second field effect transistor, and the gate of the first field effect transistor is connected to the high side gate driver output pin of the isolated gate driver. The source of the second field effect transistor is grounded, and the gate is connected to the low-side gate driver output pin of the isolated gate driver. The power input pin of the isolated gate driver is connected to the anode of the diode and is connected to the output end of the low-voltage DC source through the power input interface, the floating power pin is connected to the cathode of the diode and one end of the first capacitor, the timing capacitor pin and the timing resistor pin are connected to the timing unit, and the high-voltage floating power loop pin is connected to the other end of the first capacitor and is grounded; The withstand voltage of the first field effect tube and the second field effect tube is greater than twice the voltage of the high voltage DC source.

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