Prefabricated cabin type energy storage system and heat dissipation and noise reduction circuit thereof

Abstract

The utility model discloses a prefabricated cabin type energy storage system and a heat dissipation and noise reduction circuit thereof, and the circuit comprises a starting switch (1), a temperature negative feedback resistor unit (2) with the resistance value negatively correlated with the temperature, a charging and discharging unit (3), a bidirectional diode (VD), and a bidirectional thyristor (VS). The starting switch (1), the bidirectional thyristor (VS) and a fan motor (M) of the alternating current fan are connected in series between two ends of a fan alternating current source, and the temperature negative feedback resistor unit (2) and the charging and discharging unit (3) are connected in series to form a whole which is then connected in parallel with the bidirectional thyristor (VS). The bidirectional diode (VD) is connected between a series connection node of the temperature negative feedback resistor unit (2) and the charging and discharging unit (3) and a control electrode of the bidirectional thyristor (VS). According to the utility model, the positive correlation adjustment of the environment temperature and the fan rotating speed can be realized, so that the system noise is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical field especially relates to a prefabricated cabin type energy storage system and heat dissipation noise reduction circuit. BACKGROUND

[0002] The energy storage system container includes a battery compartment and an electrical compartment, the battery compartment stores batteries, and the electrical compartment stores PCS and other power distribution equipment. The electrical compartment is provided with an AC fan for heat dissipation. At present, a temperature relay is usually used to control the start and stop of the AC fan for heat dissipation. Figure 1 M represents the fan, KH represents the electrical contact switch of the temperature relay, and the electrical contact switch of the temperature relay is connected in series with the fan at the two ends of the 220V AC. This heat dissipation scheme by controlling the start and stop of the AC fan has a large average noise.

[0003] The above information disclosed in the background section is only included to enhance the understanding of the background of the present disclosure, and therefore can include information that does not form the prior art known to those of ordinary skill in the art at present. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem in the prior art, and provides a prefabricated cabin type energy storage system and heat dissipation noise reduction circuit.

[0005] The utility model adopts the following technical scheme to solve the technical problem:

[0006] On the one hand, a heat dissipation noise reduction circuit is constructed and applied to a prefabricated cabin type energy storage system, the system includes an AC fan arranged in an electrical compartment, the circuit is arranged in the electrical compartment, the circuit includes a start switch, a temperature negative feedback resistor unit with a resistance value negatively related to temperature, a charge and discharge unit, a bidirectional diode, and a bidirectional thyristor, the start switch, the bidirectional thyristor, and a fan motor of the AC fan are connected in series between the two ends of an AC fan source, the whole of the temperature negative feedback resistor unit and the charge and discharge unit is connected in parallel with the bidirectional thyristor, and the bidirectional diode is connected between the connection node of the temperature negative feedback resistor unit and the charge and discharge unit and the control electrode of the bidirectional thyristor.

[0007] Further, in the heat dissipation noise reduction circuit, the temperature negative feedback resistor unit includes one negative temperature coefficient resistor or multiple negative temperature coefficient resistors connected in parallel.

[0008] Further, in the heat dissipation noise reduction circuit, the temperature negative feedback resistor unit further includes a first resistor connected in series with the negative temperature coefficient resistor.

[0009] Further, the heat dissipation and noise reduction circuit, the charging and discharging unit includes a capacitor.

[0010] Further, the heat dissipation and noise reduction circuit, the temperature negative feedback resistor unit includes a first resistor, a negative temperature coefficient resistor, and the charging and discharging unit includes a capacitor.

[0011] One end of the negative temperature coefficient resistor is connected to one end of the bidirectional thyristor, and the other end of the negative temperature coefficient resistor is connected to one end of the starting switch; the other end of the starting switch is connected to the positive electrode of the fan AC source through the fan motor; the other end of the negative temperature coefficient resistor is connected to one end of the capacitor through the first resistor; the other end of the capacitor and the other end of the bidirectional thyristor are both connected to the negative electrode of the fan AC source; and the bidirectional diode is connected between the connection node of the first resistor and the capacitor and the control electrode of the bidirectional thyristor.

[0012] Further, the heat dissipation and noise reduction circuit, the starting switch includes a temperature relay; or the starting switch includes a contactor, and the contactor is controlled by a contactor control module to be turned on when over-power or / and over-current occurs.

[0013] Further, the heat dissipation and noise reduction circuit, the starting switch includes a temperature relay and a contactor, and the contactor is connected in parallel with the temperature relay; the contactor is controlled by a contactor control module to be turned on when over-power or / and over-current occurs.

[0014] Further, the heat dissipation and noise reduction circuit, the electrical bin is provided with an energy storage converter, and the contactor control module includes a current detection unit, a current comparison unit and a power supply switch unit; the power supply switch unit is used for supplying power to the coil of the contactor; the current detection unit is used for sampling the output current of the energy storage converter; the current comparison unit is connected with the current detection unit and the power supply switch unit respectively, and is used for overcurrent monitoring of the sampled output current through comparison, and triggering closing of the power supply switch unit when overcurrent occurs.

[0015] Further, the heat dissipation and noise reduction circuit, the electrical bin is provided with an energy storage converter, and the contactor control module includes a current detection unit, a voltage detection unit, a power unit, a power comparison unit and a power supply switch unit.

[0016] The power supply switch unit is used for supplying power to the coil of the contactor; the current detection unit and the voltage detection unit are used for sampling the output current and the output voltage of the energy storage converter respectively; the power unit is connected with the current detection unit and the voltage detection unit respectively, and is used for acquiring the output power according to the output current and the output voltage; the power comparison unit is connected with the power unit and the power supply switch unit respectively, and is used for monitoring the output power by comparison, and triggering the power supply switch unit to be closed when the output power is over.

[0017] In the second aspect, a prefabricated cabin type energy storage system is configured, which comprises a battery compartment and an electrical compartment, the electrical compartment is provided with an energy storage converter, an alternating current fan for heat dissipation of the electrical compartment and the heat dissipation and noise reduction circuit.

[0018] The prefabricated cabin type energy storage system and the heat dissipation and noise reduction circuit have the following beneficial effects: in the prefabricated cabin type energy storage system, when the environmental temperature is too high, the temperature negative feedback resistance unit reduces the resistance value, the charging speed of the charging and discharging unit is increased, and the fan speed is increased; on the contrary, when the temperature is reduced, the fan speed is reduced, so that the prefabricated cabin type energy storage system can realize positive correlation regulation of the environmental temperature and the fan speed, so as to reduce the system noise; further, in the prefabricated cabin type energy storage system, the starting switch is a temperature relay or a contactor, the temperature relay can close the contactor when the temperature is too high, and the contactor can close the contactor when the temperature is too high or the power is too high, so that the fan heat dissipation control can be more timely. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings:

[0020] Figure 1 is a schematic diagram of an existing alternating current fan control scheme;

[0021] Figure 2 is a top view of the prefabricated cabin type energy storage system of the present application;

[0022] Figure 3 is a circuit principle diagram of the first embodiment of the heat dissipation and noise reduction circuit of the present application;

[0023] Figure 4 is a principle block diagram of the second embodiment of the heat dissipation and noise reduction circuit of the present application;

[0024] Figure 5 is a circuit principle diagram of the second embodiment of the heat dissipation and noise reduction circuit of the present application;

[0025] Figure 6 is a circuit diagram of the current sampling unit;

[0026] Figure 7 is a circuit principle diagram of the third embodiment of the heat dissipation and noise reduction circuit of the utility model;

[0027] Figure 8 is a circuit diagram of the voltage sampling unit. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the utility model, the utility model will be described more fully below with reference to the relevant drawings. The drawings show typical embodiments of the utility model. However, the utility model can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive. It should be understood that the embodiments of the utility model and the specific features in the embodiments are detailed descriptions of the technical solutions of the application, and not limitations of the technical solutions of the application, and the technical features in the embodiments of the utility model and the embodiments can be combined with each other without conflict.

[0029] The heat dissipation and noise reduction circuit of the utility model is applied to the prefabricated cabin type energy storage system of the utility model. Referring to Figure 2 , the prefabricated cabin type energy storage system of the utility model comprises a battery compartment 102 and an electrical compartment 101 arranged side by side. The battery compartment 102 is mainly used for placing batteries. The electrical compartment 101 is mainly used for arranging energy storage converters PCS and transformers, switches, monitoring, auxiliary power distribution boxes 104, etc. For example, two PCS cabinets arranged side by side and separated are arranged in the embodiment, and the cabinet air outlets T1 of the two PCS cabinets are arranged face to face. A plurality of alternating current fans 103 for dissipating heat of the electrical compartment 101 are installed at the position of the door of the electrical compartment. The alternating current fans 103 face the area between the two PCS cabinets and are located at the air outlet position T2 of the electrical compartment. The heat dissipation and noise reduction circuit of the utility model is used for controlling the fan, and the circuit is arranged on the temperature control and speed regulation plate 105, and the temperature control and speed regulation plate 105 is installed on the side space of the PCS cabinet facing the door of the electrical compartment 101.

[0030] Embodiment one

[0031] Referring to Figure 3The heat dissipation and noise reduction circuit of the embodiment comprises a starting switch 1, a temperature negative feedback resistor unit 2 with a resistance negatively related to temperature, a charge and discharge unit 3, a bidirectional diode VD, and a bidirectional thyristor VS. The starting switch 1, the bidirectional thyristor VS, and a fan motor M of the AC fan are connected in series between the two ends of an AC fan source, the temperature negative feedback resistor unit 2 and the charge and discharge unit 3 are connected in series, and the series connection of the temperature negative feedback resistor unit 2 and the charge and discharge unit 3 is connected in parallel with the bidirectional thyristor VS. The bidirectional diode VD is connected between the connecting node of the temperature negative feedback resistor unit 2 and the charge and discharge unit 3 and the control electrode G of the bidirectional thyristor VS.

[0032] The starting switch 1 can be a common electrically controlled switch. In the embodiment, the starting switch 1 is preferably a temperature relay KH. The temperature relay KH is triggered to be turned on when the ambient temperature reaches a set temperature threshold.

[0033] The temperature negative feedback resistor unit 2 can be configured with a negative temperature coefficient resistor. In the embodiment, the temperature negative feedback resistor unit 2 is configured with multiple negative temperature coefficient resistors connected in parallel, specifically two, as shown by Rt1 and Rt2. The temperature negative feedback resistor unit 2 further comprises a first resistor R connected in series with the negative temperature coefficient resistors. The charge and discharge unit 3 comprises a capacitor C. Figure 3

[0034] One end of the negative temperature coefficient resistors Rt1 and Rt2 is connected to one end of the temperature relay KH after being connected to one end of the bidirectional thyristor VS. The other end of the temperature relay KH is connected to the positive pole of a 220V AC fan source via the fan motor M. The other end of the negative temperature coefficient resistors Rt1 and Rt2 is connected to one end of the capacitor C via the first resistor R. The other end of the capacitor C and the other end of the bidirectional thyristor VS are both connected to the negative pole of the 220V AC fan source. The bidirectional diode VD is connected between the connecting node of the first resistor R and the capacitor C and the control electrode G of the bidirectional thyristor VS.

[0035] ​The working principle of the embodiment is: when the ambient temperature reaches the set temperature threshold, the temperature relay KH is closed, the bidirectional thyristor VS is cut off, the capacitor C starts to charge, after the capacitor C is fully charged, the bidirectional diode VD reaches the critical value, the bidirectional diode VD is turned on, the current flows from the capacitor C to the bidirectional thyristor VS, and when the control voltage of the control electrode G of the bidirectional thyristor VS is reached, the bidirectional thyristor VS is turned on, so that the motor circuit is powered on. When the ambient temperature rises, the equivalent resistance of the parallel connection of the negative temperature coefficient resistors Rt1 and Rt2 decreases, so the charging speed of the capacitor C increases, and therefore the fan speed increases; on the contrary, when the ambient temperature decreases, the equivalent resistance of the parallel connection of the negative temperature coefficient resistors Rt1 and Rt2 increases, so the charging speed of the capacitor C slows down, and therefore the fan speed decreases. In this way, the present utility model can realize positive correlation regulation of the ambient temperature and the fan speed, thereby realizing reduction of system noise.

[0036] Embodiment two

[0037] Reference Figure 4 The difference between the embodiment and the embodiment one is that the starting switch 1 further comprises a contactor KM in addition to the temperature relay KH. The contactor KM is controlled by the contactor control module 4 to be turned on when overcurrent occurs. The contactor KM is connected in parallel with the temperature relay KH, and the motor circuit can be started by closing any one of the contactor KM and the temperature relay KH. Therefore, compared with the single temperature relay KH control scheme, the embodiment can also start the fan when the PCS output current overflows.

[0038] In the embodiment one, the sampling accuracy of the temperature relay KH is limited, which leads to insufficient intelligent heat dissipation of the electrical chamber, and there are problems of oversensitivity or lag, actual control error, unnecessary energy loss or system overheating, and even shutdown. Compared with the embodiment one, the embodiment further comprises the contactor KM, which can be closed and turned on when overcurrent occurs, and the accuracy is high, so that the heat dissipation control of the embodiment is more accurate.

[0039] Reference Figure 5 The contactor control module 4 comprises a current detection unit 41, a current comparison unit 42 and a power supply switch unit 43. The current detection unit 41 is used to sample the output current of the energy storage converter PCS. The current comparison unit 42 is connected with the current detection unit 41 and the power supply switch unit 43 respectively. Reference Figure 6The current detection unit 41 comprises a current sensor, resistors Rsl and Rs2, an operational amplifier U2, a resistor Rl, and a capacitor Cl. The output of the current sensor is connected to the ground via the resistors Rsl and Rs2 in sequence, the connection node of the resistors Rsl and Rs2 is connected to the positive input terminal of U2, the negative input terminal of U2 is connected to its output terminal, the output terminal of U2 is connected to the positive terminal of Cl via the resistor Rl, and the negative terminal of Cl is connected to the ground. The positive terminal of Cl is connected to the next-stage current detection unit 41 as the input of the current sampling result. The power supply switching unit 43 is used to supply power to the coil of the contactor KM, and comprises a power supply and an electrically-controlled switch. The electrically-controlled switch is connected in series in the power supply circuit of the contactor KM. The current comparison unit 42 is used to monitor the overcurrent of the sampled output current by comparison, and triggers the closing of the power supply switching unit 43 when overcurrent occurs. For example, the electrically-controlled switch of the power supply switching unit 43 is a contactor, and the current comparison unit 42 can use an analog comparator to compare the output current sampled by the current detection unit 41 with a set current. If the output current is greater than the set current, a signal is sent to close the contactor of the power supply switching unit 43.

[0040] Embodiment Three

[0041] The difference between this embodiment and Embodiment One is that the contactor KM is controlled by the contactor control module 4 to be turned on when over-power occurs. Referring to Figure 7 The contactor control module 4 comprises a current detection unit 41, a voltage detection unit 44, a power unit 45, a power comparison unit 46, and a power supply switching unit 43. The power supply switching unit 43 is used to supply power to the coil of the contactor KM. The current detection unit 41 and the voltage detection unit 44 are respectively used to sample the output current and the output voltage of the energy storage inverter PCS. The power unit 45 is connected to the current detection unit 41 and the voltage detection unit 44, and is used to obtain the output power according to the output current and the output voltage. The power comparison unit 46 is connected to the power unit 45 and the power supply switching unit 43, and is used to monitor the over-power of the obtained output power by comparison, and triggers the closing of the power supply switching unit 43 when over-power occurs.

[0042] Specifically, the voltage detection unit 44 is connected to the output of the energy storage inverter PCS via a resistor Rl, and the output of the voltage detection unit 44 is connected to the positive input terminal of an operational amplifier U2. The negative input terminal of U2 is connected to its output terminal, and the output terminal of U2 is connected to the positive terminal of a capacitor Cl via a resistor Rl. The negative terminal of Cl is connected to the ground, and the positive terminal of Cl is connected to the next-stage voltage detection unit 44 as the input of the voltage sampling result. Figure 8As shown, including voltage transformer, resistance Rs3 and Rs4, operational amplifier U1, resistance R11 and Ry11, capacitor C11 and Cy11, the output of the voltage transformer is grounded via resistance Rs3 and Rs4, the connection node of resistance Rs3 and Rs4 connects the positive input of U1 via Ry11, the positive input of U1 is also grounded via capacitor Cy11, the negative input of U1 connects its output, the output of U1 also connects the positive pole of C11 via R11, the negative pole of C11 is grounded, and the positive pole of C11 is the voltage sampling result. The current detection unit 41, the power supply switching unit 43 and the second embodiment are the same. The power unit 45 can select an analog multiplier, take the current and the voltage sampling result as the input, and output as the input of the power comparison unit 46 in the later stage. The power comparison unit 46 is the same as the current comparison unit 42, except that the comparison threshold is different. Of course, there are actually many power detection methods and circuits, which are also conventional techniques in the art, and no limitation is made here. The focus of the present embodiment is to close the power supply switching unit 43 when the power exceeds a certain threshold, thereby closing the contactor KM to start the fan. In this way, the PCS output power and the PCS ambient temperature are linked in the present embodiment to control the start and stop of the AC fan, which can further improve the actual control accuracy. In addition, the schemes of the second and third embodiments can be combined together, and the overcurrent comparison result and the power comparison result are ORed, and the contactor KM is closed to start the fan when overcurrent or overpower occurs.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing the specific embodiments only and is not intended to be limiting of the application.

[0044] The terms including ordinal numbers used in the present specification can be used to explain various constituent elements, but the constituent elements are not limited by the terms. The purpose of using the terms is only to distinguish one constituent element from other constituent elements. For example, a first constituent element can be named as a second constituent element, and similarly, a second constituent element can be named as a first constituent element without departing from the scope of the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0045] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative, but not limiting. Those skilled in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims. These are all within the protection of the present application.

Claims

1. A heat dissipation and noise reduction circuit, applied in a prefabricated cabin-type energy storage system, the system including an AC fan installed in an electrical compartment, characterized in that, The circuit is located in the electrical compartment. The circuit includes a start switch (1), a temperature negative feedback resistor unit (2) whose resistance is negatively correlated with temperature, a charging and discharging unit (3), a bidirectional diode (VD), and a bidirectional thyristor (VS). The start switch (1), the bidirectional thyristor (VS), and the fan motor (M) of the AC fan are connected in series between the two ends of the AC power source of the fan. The temperature negative feedback resistor unit (2) and the charging and discharging unit (3) are connected in series and then connected in parallel with the bidirectional thyristor (VS). The bidirectional diode (VD) is connected between the series connection node of the temperature negative feedback resistor unit (2) and the charging and discharging unit (3) and the control electrode of the bidirectional thyristor (VS).

2. The heat dissipation and noise reduction circuit according to claim 1, characterized in that, The temperature negative feedback resistor unit (2) includes a negative temperature coefficient resistor or multiple negative temperature coefficient resistors connected in parallel.

3. The heat dissipation and noise reduction circuit according to claim 2, characterized in that, The temperature negative feedback resistor unit (2) also includes a first resistor (R) connected in series with the negative temperature coefficient resistor.

4. The heat dissipation and noise reduction circuit according to claim 3, characterized in that, The charging and discharging unit (3) includes a capacitor (C).

5. The heat dissipation and noise reduction circuit according to claim 1, characterized in that, The temperature negative feedback resistor unit (2) includes a first resistor (R) and a negative temperature coefficient resistor, and the charging and discharging unit (3) includes a capacitor (C). One end of the negative temperature coefficient resistor is connected to one end of the bidirectional thyristor (VS) and then connected to one end of the start switch (1). The other end of the start switch (1) is connected to the positive terminal of the fan AC source via the fan motor (M). The other end of the negative temperature coefficient resistor is connected to one end of the capacitor (C) via the first resistor (R). The other end of the capacitor (C) and the other end of the bidirectional thyristor (VS) are both connected to the negative terminal of the fan AC source. The bidirectional diode (VD) is connected between the connection node of the first resistor (R) and the capacitor (C) and the control electrode of the bidirectional thyristor (VS).

6. The heat dissipation and noise reduction circuit according to claim 1, characterized in that, The start switch (1) includes a temperature relay (KH); or, the start switch (1) includes a contactor (KM) controlled by a contactor control module (4) to turn on in case of overpower and / or overcurrent.

7. The heat dissipation and noise reduction circuit according to claim 1, characterized in that, The start switch (1) includes a temperature relay (KH) and a contactor (KM), the contactor (KM) being connected in parallel with the temperature relay (KH), and the contactor (KM) being controlled by a contactor control module (4) to conduct in case of overpower and / or overcurrent.

8. The heat dissipation and noise reduction circuit according to any one of claims 6-7, characterized in that, The electrical compartment is equipped with an energy storage converter (PCS). The contactor control module (4) includes a current detection unit (41), a current comparison unit (42), and a power supply switch unit (43). The power supply switch unit (43) is used to supply power to the coil of the contactor (KM). The current detection unit (41) is used to sample the output current of the energy storage converter (PCS). The current comparison unit (42) is connected to the current detection unit (41) and the power supply switch unit (43) respectively, and is used to monitor the sampled output current by comparison, and trigger the closing of the power supply switch unit (43) when there is an overcurrent.

9. The heat dissipation and noise reduction circuit according to any one of claims 6-7, characterized in that, The electrical compartment is equipped with an energy storage converter (PCS), and the contactor control module (4) includes a current detection unit (41), a voltage detection unit (44), a power unit (45), a power comparison unit (46), and a power supply switch unit (43). The power supply switch unit (43) is used to supply power to the coil of the contactor (KM); the current detection unit (41) and the voltage detection unit (44) are used to sample the output current and output voltage of the energy storage converter (PCS); the power unit (45) is connected to the current detection unit (41) and the voltage detection unit (44) respectively, and is used to obtain the output power according to the output current and output voltage; the power comparison unit (46) is connected to the power unit (45) and the power supply switch unit (43) respectively, and is used to perform over-power monitoring on the obtained output power by comparison, and trigger the closing of the power supply switch unit (43) when over-power occurs.

10. A prefabricated cabin-type energy storage system, characterized in that, It includes a battery compartment and an electrical compartment, wherein the electrical compartment is equipped with an energy storage converter (PCS), an AC fan for cooling the electrical compartment, and a heat dissipation and noise reduction circuit as described in claim 1.

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