Charging and discharging integrated converter

Abstract

The utility model discloses a charging and discharging integrated converter which comprises a charging and discharging circuit and a charging and discharging switching module. The charging and discharging circuit comprises an isolating switch QS1, a charging contactor KM3, a current-limiting resistor R1, a capacitor C1, a discharging contactor KM2 and a main contactor KM1; one end of the charging contactor KM3 is connected with the positive output end of the isolating switch QS1, the other end of the charging contactor KM3 is connected with one end of the current-limiting resistor R1, the other end of the current-limiting resistor R1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is connected with the negative output end of the isolating switch QS1; one end of the main contactor KM1 is connected with the positive output end of the isolating switch QS1, and the other end of the main contactor KM1 is connected with one end of the capacitor C1. The utility model provides a charging and discharging integrated converter, which combines a charging loop and a discharging loop while meeting the charging and discharging requirements, simplifies the circuit and reduces the cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of charging and discharging integrated converter, belong to the technical field of converter. BACKGROUND

[0002] At present, as a kind of power conversion device, the main function of converter is to convert alternating current into direct current or convert direct current into alternating current. When the converter starts, the capacitor needs to be pre-charged to store energy and balance voltage during conversion. After the use of the converter ends, the high voltage large capacitor on the direct current side still stores huge electric quantity, so the capacitor needs to be discharged.

[0003] The charging circuit and discharging circuit of traditional converter are separated when designed, because the similarity of charging resistance and discharging resistance power, voltage grade is not considered, so the charging circuit and discharging circuit are separated, the charging circuit is generally placed in the alternating current side, and the discharging circuit is placed in the direct current side. And the loop structure is complex, which leads to high cost and large space occupation. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art, provide a kind of charging and discharging integrated converter, while considering charging and discharging demand, charging circuit and discharging circuit are merged, circuit is simplified, and cost is reduced.

[0005] In order to solve the above technical problems, the technical scheme of the utility model is:

[0006] A kind of charging and discharging integrated converter, it includes charging and discharging circuit and charging and discharging switching module;

[0007] The charging and discharging circuit includes disconnecting switch QS1, charging contactor KM3, current-limiting resistor R1, capacitor C1, discharging contactor KM2 and main contactor KM1;

[0008] One end of the charging contactor KM3 is connected with the positive output end of disconnecting switch QS1, the other end of the charging contactor KM3 is connected with one end of current-limiting resistor R1, the other end of current-limiting resistor R1 is connected with one end of capacitor C1, the other end of capacitor C1 is connected with the negative output end of disconnecting switch QS1;

[0009] One end of the main contactor KM1 is connected with the positive output end of disconnecting switch QS1, the other end of the main contactor KM1 is connected with one end of capacitor C1;

[0010] One end of the discharging contactor KM2 is connected with the other end of capacitor C1, the other end of the discharging contactor KM2 is connected with one end of current-limiting resistor R1;

[0011] The charge-discharge switching module is used to control the on-off of the charging contactor KM3 and the discharging contactor KM2.

[0012] Further, the charge-discharge circuit further comprises a fuse FU, and the other end of the discharging contactor KM2 is connected with one end of the current-limiting resistor R1 through the fuse FU.

[0013] Further, the discharging switching module comprises an MCU module, a relay KA1 and a relay KA2, the MCU module is used to send control signals to the relay KA1 and the relay KA2, and the on-off of the charging contactor KM3 and the discharging contactor KM2 is controlled through the relay KA1 and the relay KA2.

[0014] Further, the contact 5 pin of the relay KA1 is connected with the positive pole +220V of the auxiliary power supply, the contact 9 pin of the relay KA1 is connected with the contact 2 pin of the relay KA2, the contact 10 pin of the relay KA2 is connected with the coil A1 pin of the discharging contactor KM2, and the coil A2 pin of the discharging contactor KM2 is connected with the negative pole -220V of the auxiliary power supply.

[0015] The contact 5 pin of the relay KA2 is connected with the positive pole +220V of the auxiliary power supply, the contact 9 pin of the relay KA2 is connected with the contact 2 pin of the relay KA1, the contact 10 pin of the relay KA1 is connected with the coil A1 pin of the charging contactor KM3, and the coil A2 pin of the charging contactor KM3 is connected with the negative pole -220V of the auxiliary power supply.

[0016] Further, the models of the relay KA1 and the relay KA2 are DRM570024LT.

[0017] Further, the charge-discharge integrated converter further comprises a capacitor voltage sensor MHV1, the capacitor voltage sensor MHV1 is connected with the MCU module, and the capacitor voltage sensor MHV1 is used to monitor the real-time voltage of the capacitor C1.

[0018] Further, the charge-discharge integrated converter further comprises a bus voltage sensor MHV2, the bus voltage sensor MHV2 is connected with the MCU module, and the bus voltage sensor MHV2 is used to monitor the real-time voltage of the DC bus.

[0019] Further, the charge-discharge integrated converter further comprises an inverter module, the positive input end of the inverter module is connected with the other end of the main contactor KM1, and the negative input end of the inverter module is connected with the negative output end of the disconnecting switch QS1.

[0020] The utility model discloses adopt above -mentioned technical scheme, and according to the energy storage component, charging time and discharge time demand, give consideration to charging and discharge demand, make full use of the consistency of the parameter of charging resistance and discharge resistance, merge charging loop and discharge loop, share the charging and discharging component such as current -limiting resistance. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the circuit principle diagram of a kind of charge-discharge integrated converter of the utility model;

[0022] Figure 2 It is the charging flow chart of the utility model;

[0023] Figure 3 It is the discharge flow chart of the utility model;

[0024] Figure 4 It is the principle block diagram of the charge-discharge switching module of the utility model;

[0025] Figure 5 It is the connection schematic drawing of the interlock structure of relay KA1 and relay KA2 of the utility model. DETAILED DESCRIPTION

[0026] In order to make the content of the utility model more easily be clearly understood, the utility model is further explained in detail below according to specific embodiment and combining with drawings.

[0027] As Figure 1 Indicated, the embodiment provides a kind of charge-discharge integrated converter, it includes charge-discharge circuit and charge-discharge switching module.

[0028] Specifically, the charge-discharge circuit of the embodiment includes isolating switch QS1, charging contactor KM3, current-limiting resistor R1, capacitor C1, discharge contactor KM2, fuse FU and main contactor KM1.

[0029] The positive and negative input ends of isolating switch QS1 are connected with ±DC1500V of DC bus respectively, one end of charging contactor KM3 is connected with the positive output end of isolating switch QS1, the other end of charging contactor KM3 is connected with one end of current-limiting resistor R1, the other end of current-limiting resistor R1 is connected with one end of capacitor C1, the other end of capacitor C1 is connected with the negative output end of isolating switch QS1. One end of main contactor KM1 is connected with the positive output end of isolating switch QS1, the other end of main contactor KM1 is connected with one end of capacitor C1.

[0030] One end of discharge contactor KM2 is connected with the other end of capacitor C1, the other end of discharge contactor KM2 is connected with one end of current-limiting resistor R1 through fuse FU.

[0031] The charge-discharge switching module is used to control the on-off of the charging contactor KM3 and the discharging contactor KM2.

[0032] When charging, the charging process is as shown in Figure 2 The device is started, the charge-discharge switching module controls the charging contactor KM3 to be attracted, and the pre-charging stage is entered. When the voltage of the capacitor C1 is >1500V and the voltage difference between the voltage of the capacitor C1 and the voltage of the DC bus is <50V, the main contactor KM1 is attracted, the charging contactor KM3 is disconnected, the pre-charging ends, and the device operates. When the voltage of the capacitor C1 and the voltage difference do not satisfy the foregoing conditions, and the charging time is greater than 15S, the main contactor KM1 is not attracted, the charging contactor KM3 is disconnected, the pre-charging ends, and the device does not operate.

[0033] The current flow direction of the charging circuit is: DC bus +1500 - isolating switch QS1 - charging contactor KM3 - current limiting resistor R1 - capacitor C1.

[0034] When discharging, the discharging process is as shown in Figure 3 The device is stopped, the main contactor KM1 is disconnected, the discharging contactor KM2 is attracted, and the discharging stage is entered. When the voltage of the capacitor C1 is <50V, the discharging contactor KM2 is disconnected, and the stopped device can be touched and operated. When the capacitor voltage is ≥50V, the device cannot be touched and operated.

[0035] The current flow direction of the discharging circuit is: capacitor C1 - current limiting resistor R1 - fuse FU - discharging contactor KM2 - DC bus -1500.

[0036] As shown in Figure 4 The discharging switching module of the embodiment includes an MCU module, a relay KA1 and a relay KA2. The MCU module is used to send control signals to the relay KA1 and the relay KA2, and the on-off of the charging contactor KM3 and the discharging contactor KM2 is controlled through the relay KA1 and the relay KA2. The relay KA1 and the relay KA2 adopt an interlocking structure, and at any moment, only one of the charging contactor KM3 and the discharging contactor KM2 can be closed, and the other one is disconnected. The model of the relay KA1 and the relay KA2 of the embodiment is DRM570024LT.

[0037] Specifically, as shown in Figure 5 The contact 5 pin of the relay KA1 is connected with the positive pole +220V of the auxiliary power supply, the contact 9 pin of the relay KA1 is connected with the contact 2 pin of the relay KA2, the contact 10 pin of the relay KA2 is connected with the coil A1 pin of the discharging contactor KM2, and the coil A2 pin of the discharging contactor KM2 is connected with the negative pole -220V of the auxiliary power supply.

[0038] The contact 5 of the relay KA2 is connected with the positive pole +220V of the auxiliary power supply, the contact 9 of the relay KA2 is connected with the contact 2 of the relay KA1, the contact 10 of the relay KA1 is connected with the coil A1 of the charging contactor KM3, and the coil A2 of the charging contactor KM3 is connected with the negative pole -220V of the auxiliary power supply.

[0039] As shown in Figure 4 The charge-discharge integrated converter further comprises a capacitor voltage sensor MHV1 and a bus voltage sensor MHV2. The capacitor voltage sensor MHV1 is connected with the MCU module, and is used for monitoring the real-time voltage of the capacitor C1. The bus voltage sensor MHV2 is connected with the MCU module, and is used for monitoring the real-time voltage of the DC bus.

[0040] As shown in Figure 1 The charge-discharge integrated converter further comprises an inverter module. The positive input end of the inverter module is connected with the other end of the main contactor KM1, and the negative input end of the inverter module is connected with the negative output end of the disconnecting switch QS1.

[0041] The above embodiments are used to further explain the technical problems, technical solutions and beneficial effects solved by the utility model. It should be understood that the above embodiments are only specific embodiments of the utility model, and are not used to limit the utility model.

Claims

1. A charge-discharge integrated converter, characterized by: It includes a charging and discharging circuit and a charging and discharging switching module; The charging and discharging circuit includes an isolation switch QS1, a charging contactor KM3, a current limiting resistor R1, a capacitor C1, a discharging contactor KM2 and a main contactor KM1; One end of the charging contactor KM3 is connected with the positive output end of the isolation switch QS1, the other end of the charging contactor KM3 is connected with one end of the current limiting resistor R1, the other end of the current limiting resistor R1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the negative output end of the isolation switch QS1; One end of the main contactor KM1 is connected with the positive output end of the isolation switch QS1, the other end of the main contactor KM1 is connected with one end of the capacitor C1; One end of the discharging contactor KM2 is connected with the other end of the capacitor C1, the other end of the discharging contactor KM2 is connected with one end of the current limiting resistor R1; The charging and discharging switching module is used for controlling the on-off of the charging contactor KM3 and the discharging contactor KM2.

2. The charge and discharge integrated converter according to claim 1, characterized by: The charging and discharging circuit further includes a fuse FU, the other end of the discharging contactor KM2 is connected with one end of the current limiting resistor R1 through the fuse FU.

3. The charge-discharge integrated converter according to claim 1, characterized by: The discharging switching module includes an MCU module, a relay KA1 and a relay KA2, the MCU module is used for sending control signals to the relay KA1 and the relay KA2, and the on-off of the charging contactor KM3 and the discharging contactor KM2 is controlled through the relay KA1 and the relay KA2.

4. The charging and discharging integrated converter of claim 3, wherein: The contact 5 pin of the relay KA1 is connected with the positive pole of the auxiliary power supply, the contact 9 pin of the relay KA1 is connected with the contact 2 pin of the relay KA2, the contact 10 pin of the relay KA2 is connected with the coil A1 pin of the discharging contactor KM2, and the coil A2 pin of the discharging contactor KM2 is connected with the negative pole of the auxiliary power supply; The contact 5 pin of the relay KA2 is connected with the positive pole of the auxiliary power supply, the contact 9 pin of the relay KA2 is connected with the contact 2 pin of the relay KA1, the contact 10 pin of the relay KA1 is connected with the coil A1 pin of the charging contactor KM3, and the coil A2 pin of the charging contactor KM3 is connected with the negative pole of the auxiliary power supply.

5. The charge and discharge integrated converter according to claim 4, characterized by: The models of the relay KA1 and the relay KA2 are DRM570024LT.

6. The charge and discharge integrated converter according to claim 3, characterized by: Further comprising a capacitor voltage sensor MHV1, the capacitor voltage sensor MHV1 is connected with the MCU module, and the capacitor voltage sensor MHV1 is used for monitoring the real-time voltage of the capacitor C1.

7. The charge and discharge integrated converter according to claim 3, characterized by: Further comprising a bus voltage sensor MHV2, the bus voltage sensor MHV2 is connected with the MCU module, and the bus voltage sensor MHV2 is used for monitoring the real-time voltage of the DC bus.

8. The charge and discharge integrated converter according to claim 1, characterized by: Further comprising an inverter module, the positive input end of the inverter module is connected with the other end of the main contactor KM1, and the negative input end of the inverter module is connected with the negative output end of the isolation switch QS1.

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