Power supply circuit

Abstract

The invention discloses a power supply circuit, and relates to the technical field of rail transit. The power supply circuit comprises a first voltage conversion circuit, a second voltage conversion circuit, a third voltage conversion circuit and a fourth voltage conversion circuit, the input end of the first voltage conversion circuit is connected with a first power supply end, the input end of the second voltage conversion circuit is connected with a second power supply end, and the output end of the first voltage conversion circuit is connected with the output end of the second voltage conversion circuit to output first voltage; the input end of the third voltage conversion circuit is connected with the first voltage conversion circuit, the input end of the fourth voltage conversion circuit is connected with the second voltage conversion circuit, and the output end of the third voltage conversion circuit is connected with the output end of the fourth voltage conversion circuit and then outputs a second voltage. The power supply circuit provided by the invention is better in redundancy, better in impact robustness and better in reliability, and the safety level of the power supply circuit is improved on the basis of ensuring simplicity.

Description

Technical Field

[0001] The present invention relates to the field of rail transportation technology, and in particular to a power supply circuit. Background Art

[0002] Rail transit braking systems generally use digital / analog electro-pneumatic braking, integrating common braking, emergency braking, anti-skid control, and brake management functions into a control unit. They have extremely high safety requirements and are the last checkpoint to ensure vehicle safety. Especially with the current trend of vehicle autonomous driving and system integration, higher and higher requirements are placed on the safety of vehicle braking systems. At the same time, in the braking system, the safety of the power supply is particularly important. For the entire braking system, the power board components need to reach the SIL3 safety level.

[0003] The specific function of the power supply module in the rail transit braking system is to receive the DC110V power supply from the vehicle and then convert it into different voltage standards such as C24V voltage, P24V voltage, 5V voltage, etc. At the same time, the functional safety needs to reach the safety level of SIL3.

[0004] Some power supplies currently used in braking systems have problems such as insufficient redundancy, poor isolation, and poor robustness to shocks, and are unable to truly meet functional safety level requirements.

[0005] This section is intended to provide a background or context to the embodiments of the invention recited in the claims. No admission is made that the description herein is prior art by inclusion in this section. Summary of the invention

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a power supply circuit, which can solve at least part of the above technical problems.

[0007] A power supply circuit provided by an embodiment of the present invention includes a first voltage conversion circuit, a second voltage conversion circuit, a third voltage conversion circuit and a fourth voltage conversion circuit; wherein,

[0008] The input end of the first voltage conversion circuit is connected to the first power supply end, the input end of the second voltage conversion circuit is connected to the second power supply end, and the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit are connected to output a first voltage;

[0009] The input end of the third voltage conversion circuit is connected to the first voltage conversion circuit, the input end of the fourth voltage conversion circuit is connected to the second voltage conversion circuit, and the output end of the third voltage conversion circuit is connected to the output end of the fourth voltage conversion circuit to output a second voltage.

[0010] In some embodiments, the first voltage conversion circuit includes a first fuse, a first EMC module, a first power conversion module and a first diode connected in series in sequence; the second voltage conversion circuit includes a second fuse, a second EMC module, a second power conversion module and a second diode connected in series in sequence.

[0011] In some embodiments, the input end of the first fuse is connected to the first power supply end, the input end of the second fuse is connected to the second power supply end, and the output end of the first diode and the output end of the second diode are connected to output the first voltage.

[0012] In some embodiments, a third diode is further included, wherein an input end of the third diode is respectively connected to an output end of the first diode and an output end of the second diode, and an output end of the third diode outputs a third voltage.

[0013] In some embodiments, the third voltage conversion circuit includes a third power conversion module and a first ideal diode connected in series; the fourth voltage conversion circuit includes a fourth power conversion module and a second ideal diode connected in series;

[0014] In some embodiments, the input end of the third power conversion module is connected to the output end of the first power conversion module, the input end of the fourth power conversion module is connected to the output end of the second power conversion module, and the output end of the first ideal diode and the output end of the second ideal diode are connected to output the second voltage.

[0015] In some embodiments, a fault warning circuit is also included, and the fault warning circuit is connected to the third voltage conversion circuit and the fourth voltage conversion circuit respectively, and sends a fault warning signal when an abnormal signal is monitored.

[0016] In some embodiments, the fault warning circuit includes a first voltage stabilizing diode, a second voltage stabilizing diode, a first transistor, a second transistor, and a third transistor; wherein,

[0017] The first end of the first voltage stabilizing diode is connected to the output end of the third power conversion module, and the second end of the first voltage stabilizing diode is connected to the base of the first transistor;

[0018] The first end of the second voltage stabilizing diode is connected to the output end of the fourth power conversion module, and the second end of the second voltage stabilizing diode is connected to the base of the second transistor;

[0019] The collector of the first transistor is connected to the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit, and the emitter of the first transistor is grounded;

[0020] The collector of the second transistor is connected to the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit, and the emitter of the second transistor is grounded;

[0021] The base of the third transistor is connected to the collector of the first transistor and the collector of the second transistor, the emitter of the third transistor is grounded, and the collector of the third transistor outputs a fault warning signal.

[0022] In some embodiments, the first voltage includes a 24V DC voltage, and the second voltage includes a 5V DC voltage.

[0023] In some embodiments, the voltage provided by the first power supply end includes a 110V DC voltage, and the voltage provided by the second power supply end includes a 110V DC voltage.

[0024] The power supply circuit provided by the embodiment of the present invention receives two-way vehicle power supply, and then converts it into two output voltages through two voltage conversion circuits respectively. The two output voltages are connected in parallel as the final output and used by other components of the braking system. It can be seen that the present invention designs a new redundant architecture based on the existing widely used power supply circuit (power supply module) redundant architecture, so that the redundancy of the entire power supply circuit is better, the impact robustness is better, the reliability is better, and the safety level of the power supply circuit is improved on the basis of ensuring simplicity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 It is a structural schematic diagram of a power supply circuit provided by an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of a third voltage conversion circuit and a fourth voltage conversion circuit provided by an embodiment of the present invention.

[0028] Figure 3 It is a structural schematic diagram of a fault warning circuit provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Here, the illustrative embodiments of the present application and their descriptions are used to explain the present application, but are not intended to limit the present application. It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be arbitrarily arranged with each other.

[0030] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit this application. They are only used to distinguish elements or operations described with the same technical terms.

[0031] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0032] As used herein, "and / or" includes any and all permutations of the items described.

[0033] Figure 1 is a schematic diagram of a power supply circuit provided by an embodiment of the present invention, such as Figure 1 As shown, the power supply circuit 01 provided in the embodiment of the present invention includes a first voltage conversion circuit 10, a second voltage conversion circuit 20, a third voltage conversion circuit 30 and a fourth voltage conversion circuit 40; wherein,

[0034] The input end of the first voltage conversion circuit 10 is connected to the first power supply end, the input end of the second voltage conversion circuit 20 is connected to the second power supply end, and the output end of the first voltage conversion circuit 10 and the output end of the second voltage conversion circuit 20 are connected to output a first voltage;

[0035] The input end of the third voltage conversion circuit 30 is connected to the first voltage conversion circuit 10, the input end of the fourth voltage conversion circuit 40 is connected to the second voltage conversion circuit 20, and the output end of the third voltage conversion circuit 30 is connected to the output end of the fourth voltage conversion circuit 40 to output a second voltage.

[0036] The power supply circuit provided by the embodiment of the present invention receives two-way vehicle power supply, and then converts it into two output voltages through two voltage conversion circuits respectively. The two output voltages are connected in parallel as the final output and used by other components of the braking system. It can be seen that the present invention designs a new redundant architecture based on the existing widely used power supply circuit (power supply module) redundant architecture, so that the redundancy of the entire power supply circuit is better, the impact robustness is better, the reliability is better, and the safety level of the power supply circuit is improved on the basis of ensuring simplicity.

[0037] like Figure 1As shown, in some embodiments, the first voltage conversion circuit 10 includes a first fuse 11, a first EMC module 12, a first power conversion module 13 and a first diode 14 connected in series in sequence; the second voltage conversion circuit 20 includes a second fuse 21, a second EMC module 22, a second power conversion module 23 and a second diode 24 connected in series in sequence.

[0038] For example, Figure 1 As shown, the power supply circuit 01 of the present invention receives two vehicle DC110V power supplies DC110V_1 and DC110V_2, and then passes through the fuse to the protection and filtering module (EMC module) of the back stage. The protection and filtering module can prevent surge impact, long-term large voltage impact and eliminate some ripple noise on the voltage. Then it is converted into two voltage systems C24V_1 and C24V_2 through two identical DC110V to DC24V power conversion modules. The two signals of C24V_1 and C24V_2 are then respectively connected through diodes to C24V signals, which are output to other components of the brake system for use, for example, they can power the control device of the brake system.

[0039] like Figure 1 As shown, in some embodiments, the input end of the first fuse 11 is connected to the first power supply end, the input end of the second fuse 21 is connected to the second power supply end, and the output end of the first diode 14 and the output end of the second diode 24 are connected to output the first voltage.

[0040] like Figure 1 As shown, in some embodiments, the power supply circuit 01 further includes a third diode 50, the input end of the third diode 50 is respectively connected to the output end of the first diode 14 and the output end of the second diode 24, and the output end of the third diode 50 outputs a third voltage.

[0041] For example, the third voltage may be a P24V voltage, which may be used to power power devices of a braking system.

[0042] like Figure 2 As shown, in some embodiments, the third voltage conversion circuit 30 includes a third power conversion module 31 and a first ideal diode 32 connected in series; the fourth voltage conversion circuit 40 includes a fourth power conversion module 41 and a second ideal diode 42 connected in series.

[0043] like Figure 2As shown, in some embodiments, the input end of the third power conversion module 31 is connected to the output end of the first power conversion module 13, the input end of the fourth power conversion module 41 is connected to the output end of the second power conversion module 23, and the output end of the first ideal diode 32 and the output end of the second ideal diode 42 are connected to output the second voltage.

[0044] For example, Figure 1 As shown, the two signals C24V_1 and C24V_2 are converted into two voltage systems, 5V_1 and 5V_2, respectively, through two identical DC24V to DC5V power conversion modules. The two signals 5V_1 and 5V_2 are then respectively converted into 5V signals through ideal diodes and output to other components of the braking system for use. Each of the ideal diodes can be controlled by a microcontroller. When the 5V_1 signal is higher than the 5V signal, the first DC24V to DC5V power conversion circuit works, and when the 5V_2 signal is higher than the 5V signal, the second DC24V to DC5V power conversion circuit works, that is, the circuit where the higher signal of the 5V_1 signal and the 5V_2 signal is located is turned on for output. In this way, the forward voltage drop of the output terminals 5V_1 and 5V_2 is reduced, ensuring smooth current output without oscillation.

[0045] like Figure 3 As shown, in some embodiments, the power supply circuit 01 also includes a fault warning circuit 60, and the fault warning circuit 60 is respectively connected to the third voltage conversion circuit 30 and the fourth voltage conversion circuit 40, and sends a fault warning signal when an abnormal signal is detected.

[0046] like Figure 3 As shown, in some embodiments, the fault warning circuit 60 includes a first voltage stabilizing diode 61, a second voltage stabilizing diode 62, a first triode 63, a second triode 64 and a third triode 65; wherein,

[0047] The first end of the first voltage stabilizing diode 61 is connected to the output end of the third power conversion module 31, and the second end of the first voltage stabilizing diode 61 is connected to the base of the first transistor 63;

[0048] A first end of the second voltage stabilizing diode 62 is connected to the output end of the fourth power conversion module 41 , and a second end of the second voltage stabilizing diode 62 is connected to the base of the second transistor 64 ;

[0049] The collector of the first transistor 63 is connected to the output end of the first voltage conversion circuit 10 and the output end of the second voltage conversion circuit 20, and the emitter of the first transistor 63 is grounded;

[0050] The collector of the second transistor 64 is connected to the output end of the first voltage conversion circuit 10 and the output end of the second voltage conversion circuit 20, and the emitter of the second transistor 64 is grounded;

[0051] The base of the third transistor 65 is connected to the collector of the first transistor 63 and the collector of the second transistor 64 , the emitter of the third transistor 65 is grounded, and the collector of the third transistor 65 outputs a fault warning signal.

[0052] For example, Figure 3 As shown, the fault warning circuit 60 collects two signals, 5V_1 and 5V_2. The two signals pass through the voltage-stabilizing diodes respectively, and then pass through the transistors with C24V as the pull-up voltage respectively, and finally are combined into one signal to drive the transistor to output the Pwrfault signal.

[0053] The fault warning circuit 60 can monitor the fault of each conversion circuit. When the first DC110V to DC24V circuit has a short circuit or an open circuit, the C24V_1 signal must be abnormal, so the 5V_1 signal will also be abnormal. When the 5V_1 signal is abnormal, the C24V signal drives the first transistor 63, and then the Pwrfault signal output is a low level. When the first DC24V to DC5V circuit has a short circuit or an open circuit, the 5V_1 signal must be abnormal. When the 5V_1 signal is abnormal, the C24V signal drives the first transistor 63, and then the Pwrfault signal output is a low level. Similarly, when the second DC110V to DC24V circuit and the second DC24V to DC5V circuit have a short circuit or an open circuit, the fault warning circuit 60 can monitor and report a fault warning signal. Full redundancy and fault monitoring and warning of each redundant circuit are achieved.

[0054] In terms of safety, when the first DC110V to DC24V circuit has a short circuit or open circuit, the C24V_1 signal is abnormal, which will not cause the C24V_2 signal to be abnormal, nor will it cause the 5V_2 signal to be abnormal. Therefore, the C24V signal and the 5V signal can still be output normally, ensuring functional safety. When the first DC24V to DC5V circuit has a short circuit or open circuit, the 5V_1 signal is abnormal, and the C24V_1 signal may also be abnormal, but it will not cause the C24V_2 signal to be abnormal, nor will it cause the 5V_2 signal to be abnormal. Therefore, the C24V signal and the 5V signal can still be output normally, ensuring functional safety.

[0055] At the same time, when a short circuit or overcurrent occurs in each circuit, two fuses are used as protective devices to protect the safety of the vehicle power input, which will not cause the vehicle circuit breaker to be disconnected at will, increase the robustness of the system impact, and ensure the sensitivity to faults.

[0056] In some embodiments, the first voltage includes a 24V DC voltage, and the second voltage includes a 5V DC voltage.

[0057] In some embodiments, the voltage provided by the first power supply end includes a 110V DC voltage, and the voltage provided by the second power supply end includes a 110V DC voltage.

[0058] It can be seen that the power supply circuit provided in the embodiment of the present invention can be used as a power supply module for the braking system, which can receive the DC110V power supply of the vehicle, provide two voltage systems of DC24V and DC5V to other control modules of the braking system, and have a fault warning function. Specifically, the power supply circuit converts the two DC110V power supplies received from the vehicle into a "clean" DC110V power supply with relatively small ripple noise after passing through the protection and filtering module (EMC module), and then converts it into a DC24V voltage system through a DC110V to DC24V power conversion module, and then converts it into a DC5V voltage system through a DC24V to DC5V power conversion module. Among them, DC110V to DC24V is two-way redundant, and DC24V to 5V is two-way redundant, and the fault warning circuit can diagnose the fault of each redundant circuit. The 5V output voltage fluctuates little and has a reverse transient current suppression effect. It can be seen that the power supply circuit provided by the embodiment of the present invention overcomes the problems in the prior art that the power supply circuit is not completely isolated, the 24V and 5V circuit conversion circuits cannot be completely redundant, the impact robustness is poor, and the 5V output voltage forward voltage drop is large.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "a specific embodiment", "some embodiments", "for example", "example", "specific example", or "some examples" 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 application. In this specification, the schematic representation of the above terms does not necessarily refer 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.

[0060] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A power supply circuit, characterized in that: It includes a first voltage conversion circuit, a second voltage conversion circuit, a third voltage conversion circuit and a fourth voltage conversion circuit; wherein, The input end of the first voltage conversion circuit is connected to the first power supply end, the input end of the second voltage conversion circuit is connected to the second power supply end, and the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit are connected to output a first voltage; The input end of the third voltage conversion circuit is connected to the first voltage conversion circuit, the input end of the fourth voltage conversion circuit is connected to the second voltage conversion circuit, and the output end of the third voltage conversion circuit is connected to the output end of the fourth voltage conversion circuit to output a second voltage.

2. The power supply circuit according to claim 1, characterized in that: The first voltage conversion circuit comprises a first fuse, a first EMC module, a first power conversion module and a first diode connected in series in sequence; The second voltage conversion circuit includes a second fuse, a second EMC module, a second power conversion module and a second diode which are connected in series in sequence.

3. The power supply circuit according to claim 2, characterized in that: The input end of the first fuse is connected to the first power supply end, the input end of the second fuse is connected to the second power supply end, and the output end of the first diode and the output end of the second diode are connected to output the first voltage.

4. The power supply circuit according to claim 3, characterized in that: It also includes a third diode, the input end of the third diode is respectively connected to the output end of the first diode and the output end of the second diode, and the output end of the third diode outputs a third voltage.

5. The power supply circuit according to claim 3, characterized in that: The third voltage conversion circuit comprises a third power conversion module and a first ideal diode connected in series; The fourth voltage conversion circuit includes a fourth power conversion module and a second ideal diode connected in series.

6. The power supply circuit according to claim 5, characterized in that: The input end of the third power conversion module is connected to the output end of the first power conversion module, the input end of the fourth power conversion module is connected to the output end of the second power conversion module, and the output end of the first ideal diode and the output end of the second ideal diode are connected to output the second voltage.

7. The power supply circuit according to claim 6, characterized in that: It also includes a fault warning circuit, which is connected to the third voltage conversion circuit and the fourth voltage conversion circuit respectively, and sends out a fault warning signal when an abnormal signal is monitored.

8. The power supply circuit according to claim 7, characterized in that: The fault warning circuit includes a first voltage stabilizing diode, a second voltage stabilizing diode, a first transistor, a second transistor and a third transistor; wherein, The first end of the first voltage stabilizing diode is connected to the output end of the third power conversion module, and the second end of the first voltage stabilizing diode is connected to the base of the first transistor; The first end of the second voltage stabilizing diode is connected to the output end of the fourth power conversion module, and the second end of the second voltage stabilizing diode is connected to the base of the second transistor; The collector of the first transistor is connected to the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit, and the emitter of the first transistor is grounded; The collector of the second transistor is connected to the output end of the first voltage conversion circuit and the output end of the second voltage conversion circuit, and the emitter of the second transistor is grounded; The base of the third transistor is connected to the collector of the first transistor and the collector of the second transistor, the emitter of the third transistor is grounded, and the collector of the third transistor outputs a fault warning signal.

9. The power supply circuit according to claim 1, characterized in that: The first voltage includes a 24V DC voltage, and the second voltage includes a 5V DC voltage.

10. The power supply circuit according to claim 1, characterized in that: The voltage provided by the first power supply end includes a 110V DC voltage, and the voltage provided by the second power supply end includes a 110V DC voltage.

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