Power equipment, detection method and charging pile

Abstract

The invention discloses power equipment, a detection method and a charging pile. The power equipment comprises a first power circuit, a second power circuit, a controller and a switch module, the first power circuit and the second power circuit are connected in series or in parallel through a switch in the switch module; and the controller is used for controlling at least one switch in the switch module to be closed, controlling the first power circuit to output a preset voltage, and judging the state of the at least one switch in the switch module according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power equipment. According to the technical scheme, whether the relay fails or not can be effectively and accurately detected on the premise that an auxiliary circuit is not added.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a power device, a detection method and a charging pile. Background Art

[0002] The power equipment of the charging pile includes two power circuits. The output ends of the two power circuits are connected in series and parallel, that is, the two power circuits can be connected in parallel to output power, or the two power circuits can be connected in series to output power according to the requirements of the charging load.

[0003] Generally, the output ends of the two power circuits need to be connected to relays to realize the switching of the two power circuits in series and in parallel. However, the sticking fault and the normally-off fault of the relay cannot be effectively detected, which may cause the risk of machine damage or personal injury during operation. Alternatively, additional auxiliary circuits need to be added to realize the detection function of the series-parallel relays, which is costly. Summary of the invention

[0004] In view of this, the present application provides a power device, a detection method and a charging pile, which can effectively and accurately detect whether a relay is faulty without adding an auxiliary circuit.

[0005] The present application provides a power device, including: a first power circuit, a second power circuit, a controller and a switch module; the first power circuit and the second power circuit are connected in series or in parallel through a switch in the switch module; the controller is used to control at least one switch in the switch module to close, control the first power circuit to output a preset voltage, and judge the state of at least one switch in the switch module according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

[0006] In a possible implementation, the switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; the controller is used to control the third switch to be closed, the first switch and the second switch to be opened, and the first power circuit to output a preset voltage; and the state of at least one of the first switch, the second switch and the third switch is determined according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

[0007] In one possible implementation, the controller is used to control the first power circuit to output the preset voltage, and when the first output voltage and the third output voltage are both consistent with the preset voltage and the second output voltage is zero, it is determined that the third switch is normally closed and the first switch is normally disconnected.

[0008] In one possible implementation, the controller is used to control the first power circuit to output the preset voltage, and when the first output voltage, the second output voltage and the third output voltage are all consistent with the preset voltage, it is determined that the first switch and the second switch are both stuck and the third switch is not closed.

[0009] In one possible implementation, the controller is used to control the first power circuit to output the preset voltage, and when the first output voltage, the second output voltage and the third output voltage are all zero, it is determined that the third switch is normally energized and the first switch is stuck.

[0010] In one possible implementation, the controller is used to control the first power circuit to output the preset voltage, and when the first output voltage is consistent with the preset voltage and the third output voltage and the second output voltage are both zero, it is determined that the third switch is not closed.

[0011] In one possible implementation, the controller is also used to control the second power circuit to also output the preset voltage when the state of the target switch in the switch module is normal, and determine the states of all switches in the switch module based on the preset voltage, the first output voltage, the second output voltage and the third output voltage.

[0012] In one possible implementation, the controller is specifically used to control the second power circuit to output the preset voltage, and when the third output voltage is equal to twice the preset voltage, it is determined that the third switch is closed, and the first switch and the second switch are both disconnected.

[0013] In one possible implementation, the controller is specifically used to control the second power circuit to output the preset voltage, the first output voltage and the third output voltage are both consistent with the preset voltage, and it is determined that the third switch is closed, the first switch is disconnected, and the second switch is stuck.

[0014] In a possible implementation, the power device also includes a discharge circuit, the discharge circuit includes a resistor and a fourth switch connected in series, and the discharge circuit is connected in parallel to the positive output terminal and the negative output terminal of the power device; the controller is also used to control the fourth switch to be closed, and when the third output voltage, the first output voltage and the second output voltage are all zero, it is judged that the fourth switch is closed normally, otherwise it is judged that the fourth switch is failed.

[0015] In a possible implementation, the switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; the controller is used to control the first switch to close and control the first power circuit to output a preset voltage; the state of the first switch is judged according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device; when it is determined that the first switch is normally energized, the second switch is controlled to close, and the state of the second switch is judged according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

[0016] In a possible implementation, the controller is also used to control the second switch to close, raise the output voltage of the second power circuit or the output voltage of the first power circuit when the first switch is normally energized, and determine whether the second switch is normal based on the preset voltage, the second output voltage, the first output voltage and the third output voltage.

[0017] In a possible implementation, the power device also includes a discharge circuit, the discharge circuit includes a resistor and a fourth switch connected in series, and the discharge circuit is arranged between the positive output terminal and the negative output terminal of the power device; the controller is further used to control the fourth switch to be closed after controlling the second switch to be closed, and judge the states of the second switch and the fourth switch according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

[0018] In one possible implementation, the controller is specifically used to control the first power circuit to output a preset voltage, and when the first output voltage and the third output voltage are both consistent with the preset voltage, it is determined that the first switch or the third switch is normally closed; the controller is specifically used to control the first power circuit to output a preset voltage, and when the first output voltage is consistent with the preset voltage and the second output voltage and the third output voltage are both zero, it is determined that the first switch is not closed.

[0019] In one possible implementation, the controller is specifically used to control the second power circuit to output a preset voltage, and when the first output voltage, the second output voltage, and the third output voltage are all consistent with the preset voltage, it is determined that the first switch is normally closed and the third switch is normally disconnected; the controller is specifically used to control the second power circuit to output a preset voltage, and when the first output voltage, the second output voltage, and the third output voltage are all consistent with the preset voltage, it is determined that the first switch is not closed and the third switch is normally closed.

[0020] In one possible implementation, the controller is specifically used to control the second switch to be energized and the fourth switch to be energized, and when the first output voltage, the second output voltage and the third output voltage are all zero, it is determined that the fourth switch, the first switch and the second switch are all normal.

[0021] The present application also provides a detection method for a power device, wherein the power device comprises: a first power circuit, a second power circuit, a controller and a switch module; the first power circuit and the second power circuit are connected in series or in parallel via a switch in the switch module; the method comprises: controlling at least one switch in the switch module to close, controlling the first power circuit to output a preset voltage; determining the state of at least one switch in the switch module according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

[0022] In a possible implementation, the switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; the state of at least one switch in the switch module is determined according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device, specifically including: controlling the third switch to close, the first switch and the second switch to open, and controlling the first power circuit to output the preset voltage; judging the state of at least one switch among the first switch, the second switch and the third switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

[0023] In a possible implementation, the switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; the state of at least one switch in the switch module is determined according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device, specifically including: controlling the first switch to close and controlling the first power circuit to output the preset voltage; judging the state of the first switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device; and judging the state of the second switch according to the preset voltage, the second output voltage, the first output voltage and the third output voltage when it is determined that the first switch is normally closed.

[0024] The present application also provides a charging pile, including the power device introduced above.

[0025] The power device provided in the embodiment of the present application can detect adhesion and normal disconnection of at least one switch in the power device when two power circuits are connected in series. There is no need to add additional auxiliary circuits. It only controls the power circuit to output a preset voltage, detects the output voltage of each power circuit and the total voltage of the power device, and compares the output voltage with the preset voltage. It is then possible to accurately detect whether at least one switch is normal. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of a power device provided in an embodiment of the present application;

[0027] Figure 2A A schematic diagram of another power device provided in an embodiment of the present application;

[0028] Figure 2B A schematic diagram of the output terminals of a power device provided in an embodiment of the present application being connected in series;

[0029] Figure 3 A schematic diagram of another output terminal of a power device provided in an embodiment of the present application being connected in series;

[0030] Figure 4 A schematic diagram of parallel connection of output ends of a power device provided in an embodiment of the present application;

[0031] Figure 5 A schematic diagram of another type of parallel connection of output ends of a power device provided in an embodiment of the present application;

[0032] Figure 6A schematic diagram of a power device provided in an embodiment of the present application including a discharge circuit and connected in parallel;

[0033] Figure 7 A flow chart of a method for detecting a power device provided in an embodiment of the present application;

[0034] Figure 8 A flow chart of another method for detecting a power device provided in an embodiment of the present application;

[0035] Fig. 9 A flowchart of another method for detecting a power device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] See also Figure 1 , which is a schematic diagram of a power device provided in an embodiment of the present application.

[0037] The power device provided in the embodiment of the present application includes: a first power circuit 100 , a second power circuit 200 , a controller 300 and a switch module 400 .

[0038] The first power circuit 100 and the second power circuit 200 are connected in series or in parallel via switches in the switch module 400 .

[0039] The controller 300 is used to control at least one switch in the switch module 400 to close, control the first power circuit 100 to output a preset voltage, and determine the state of at least one switch in the switch module 400 based on the preset voltage, the first output voltage of the first power circuit 100, the second output voltage of the second power circuit 200 and the third output voltage of the power device.

[0040] It should be understood that since the input terminals of the first power circuit 100 and the second power circuit 200 are connected to a DC source, the controller 300 can send a driving signal to the controllable switch in any power circuit to make the power circuit output a preset voltage.

[0041] The power device provided in the embodiment of the present application does not specifically limit the number of switches included in the switch module 400. If parallel and series connection are to be achieved, at least three switches need to be set up, one switch is used to achieve the series connection of the first power circuit 100 and the second power circuit 200, and the other two switches are used to achieve the parallel connection of the first power circuit 100 and the second power circuit 200.

[0042] The embodiment of the present application does not specifically limit the number of closed switches in the controller-controlled switch module 400. For example, one switch can be closed to connect the output end of the first power circuit 100 and the output end of the second power circuit 200 in series. When the first power circuit 100 outputs a preset voltage, if the series-connected switch is normal, the third output voltage of the power device should be equal to the preset voltage. Since the controller does not control the second power circuit 200 to output the preset voltage, when the series-connected switch is normal, the second output voltage of the second power circuit 200 is not equal to the preset voltage. Therefore, the power device provided in the embodiment of the present application can be completely controlled by software, and it is not necessary to add auxiliary hardware circuits to detect whether the switch is normal.

[0043] Similarly, the controller can also control the parallel switches to close, control the first power circuit 100 to output a preset voltage, and then detect whether the second output voltage of the second power circuit 200 is equal to the preset voltage, and detect whether the third output voltage of the power device is equal to the preset voltage, and then determine whether the parallel switches are normal.

[0044] The power device provided in the embodiment of the present application does not specifically limit the specific positional relationship between the first power circuit and the second power circuit, and the two have equal status. For example, when two power circuits are connected in series, the first power circuit can be connected to the positive output terminal of the power device, or the second power circuit can be connected to the positive output terminal of the power device. This application does not make specific limitations. Therefore, this application first controls the first power circuit to output a preset voltage, or first controls the second power circuit to output a preset voltage. In all the following implementations, the order in which the first power circuit and the second power circuit output the preset voltage can be interchanged. The following embodiments are only for ease of understanding, and are introduced by taking the example of first controlling the first power circuit to output the preset voltage.

[0045] See also Figure 2A , which is a schematic diagram of another power device provided in an embodiment of the present application.

[0046] In order to enable those skilled in the art to more clearly understand the technical solution provided by the present application, the working principle of the power device is briefly described below.

[0047] The power device 1000 provided in the embodiment of the present application includes: a first power circuit 100 and a second power circuit 200, a first switch K1, a second switch K2 and a third switch K3; in addition, there is also a controller, which is not shown in the figure.

[0048] The two ends of the first switch K1 are respectively connected to the positive output end of the first power circuit 100 and the positive output end of the second power circuit 200; the two ends of the second switch K2 are respectively connected to the negative output end of the first power circuit 100 and the negative output end of the second power circuit 200; the two ends of the third switch K3 are respectively connected to the negative output end of the first power circuit 100 and the positive output end of the second power circuit 200.

[0049] In one embodiment, the positive output terminal of the first power circuit 100 serves as the positive output terminal Vout+ of the power unit 1000 , and the negative output terminal of the second power circuit 200 serves as the negative output terminal Vout− of the power unit 1000 .

[0050] The controller can control the connection mode between the output ends of the two power circuits by controlling three switches. When the first switch K1 and the second switch K2 are closed, and the third switch K3 is disconnected, the output end of the first power circuit 100 and the output end of the second power circuit 200 are in a parallel relationship, and the output voltage of the power device is equal to the voltage of any one of the power circuits. When the third switch K3 is closed, the first switch K1 and the second switch K2 are disconnected, the output end of the first power circuit 100 and the output end of the second power circuit 200 are in a series relationship, and the output voltage of the power device is the sum of the voltages of the two power circuits.

[0051] The embodiment of the present application does not specifically limit the specific circuits and application scenarios of the first power circuit 100 and the second power circuit 200. For example, the first power circuit 100 and the second power circuit 200 may specifically be LLC circuits, that is, resonant LLC conversion circuits.

[0052] The embodiment of the present application does not specifically limit the specific types of the first switch K1, the second switch K2 and the third switch K3. For example, they can be relays or other switches. The specific switch state is controlled by the controller sending a control signal.

[0053] When the power device is actually working, the output ends of the two power circuits may be connected in parallel or in series. The following describes various corresponding detection methods for the two cases of series and parallel connection respectively.

[0054] See also Figure 2B , which is a schematic diagram of the series connection of the output ends of a power device provided in an embodiment of the present application.

[0055] The power device 1000 provided in the embodiment of the present application includes an output end of a first power circuit 100 and an output end of a second power circuit 200 connected in series, that is, the third switch K3 is closed, and the first switch K1 and the second switch K2 are both opened.

[0056] The controller is used to control the third switch to close, control the first power circuit to output a preset voltage, and determine whether the first switch, the second switch and the third switch are normal according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

[0057] It should be understood that the controller may specifically send a driving signal to the first power circuit 100 to enable the first power circuit 100 to output a preset voltage.

[0058] Since the output end of the first power circuit 100 and the output end of the second power circuit 200 are connected in series, the controller can control the output voltage of the first power circuit 100 to be a preset voltage, and the second power circuit 200 does not work first and does not output voltage. In this way, it can be detected whether the voltage of the working power circuit and the total output voltage of the power device are both preset voltages, and whether the output voltage of the non-working power circuit is 0; if so, that is, the output voltage of the working power circuit and the total output voltage of the power device are both preset voltages, and the output voltage of the non-working working circuit is 0. For example, the controller is used to control the first power circuit to output a preset voltage. When the first output voltage and the third output voltage are consistent with the preset voltage, and the second output voltage is zero, it is judged that the third switch is normally attracted and the first switch is normally disconnected, that is, the third switch K3 is closed and the first switch K1 is disconnected, that is, K1 and K3 are both normal. Otherwise, it means that there is a switch failure. The following is an example of the controller controlling the first power circuit to output the preset voltage. It should be understood that the status of the first power circuit and the second power circuit are equal, and the opposite principle also applies.

[0059] It should be understood that the power device provided in the embodiment of the present application will terminate subsequent detection and issue an alarm or perform maintenance if any switch is detected to be abnormal.

[0060] The power device provided in the embodiment of the present application can detect adhesion and normal disconnection of three switches in a scenario where two power circuits are connected in series. There is no need to add additional auxiliary circuits. Only by controlling the output voltage of the power circuit and performing voltage detection, it is possible to accurately detect whether each switch is normal.

[0061] The specific fault conditions are as follows:

[0062] 1. A controller, used to control the first power circuit to output a preset voltage, and the first output voltage, the second output voltage and the third output voltage are all consistent with the preset voltage, and it is judged that the first switch and the second switch are both stuck, and the third switch is not pulled in. That is, if the first output voltage, the second output voltage and the third output voltage are all equal to the preset voltage, it means that K3 is disconnected, and K1 and K2 are both stuck.

[0063] 2. A controller, used to control the first power circuit to output a preset voltage, and the first output voltage, the second output voltage and the third output voltage are all zero, and it is judged that the third switch is normally closed and the first switch is stuck. That is, if the first output voltage, the second output voltage and the third output voltage are all equal to 0, it means that K3 is closed and K1 is stuck.

[0064] 3. A controller is used to control the first power circuit to output a preset voltage. If the first output voltage is consistent with the preset voltage, and the third output voltage and the second output voltage are both zero, it is judged that the third switch is not closed. That is, if the first output voltage is equal to the preset voltage, and the second output voltage and the third output voltage are both equal to 0, it means that K3 refuses to move and is not closed.

[0065] The detection process described in the above text can be seen in Table 1 below.

[0066] Table 1

[0067] Output voltage relationship Relay Status Test results <![CDATA[V A ≈V T ≈V 1 , and V B ≈0 hours]]> K3 is energized, K1 is not energized normal <![CDATA[V A ≈V B ≈V T ≈V 1 ]]> K1 and K2 are stuck, and K3 refuses to move and does not close Fault <![CDATA[V A ≈V B ≈V T ≈0]]> K3 is closed, K1 is adhered Fault <![CDATA[V A ≈V 1 , and V T ≈V B ≈0 hours]]> K3 refused to operate and did not close Fault

[0068] In Table 1, V A Represents the first output voltage, V B Represents the second output voltage, V T Represents the third output voltage, V 1 Indicates the preset voltage.

[0069] For a more comprehensive detection, when the third switch K3 is closed and the first switch K1 is opened, another power circuit is continuously controlled to output a preset voltage to detect the fault of other switches.

[0070] The controller is also used to control the second power circuit to output a preset voltage, the third output voltage is equal to twice the first output voltage, and equal to twice the second output voltage, and equal to twice the preset voltage, and the third switch is judged to be closed, and the first switch and the second switch are both disconnected. At this time, when the third output voltage is detected to be twice the first output voltage, and twice the second output voltage, and twice the preset voltage, it means that K3 is closed, and K1 and K2 are both disconnected.

[0071] The controller is also used to control the second power circuit to output a preset voltage, and the first output voltage and the third output voltage are both consistent with the preset voltage, and judge that the third switch is closed, the first switch is disconnected, and the second switch is adhered. That is, if the first output voltage and the third output voltage are both preset voltages, and the second output voltage is 0, it means that K3 is closed, K1 is disconnected, and K2 is adhered; that is, K3 and K1 are normal, and K2 is faulty.

[0072] The above text introduces the detection process, which can be seen in Table 2 below.

[0073] Table 2

[0074] Output voltage relationship Relay Status Test results <![CDATA[V T ≈2V A ≈2V B ≈2V 1 ]]> K3 is energized, K1 and K2 are not energized normal <![CDATA[V A ≈V T ≈V 1 , V B ≈0 hours]]> K3 is closed, K1 is not closed, and K2 is stuck Fault

[0075] The embodiment of the present application does not specifically limit the specific value of the preset voltage. It is mainly for the purpose of detecting each switch, as long as the preset voltage can meet the detection accuracy.

[0076] The power device provided in the embodiment of the present application may also include a discharge circuit, which includes a switch and a resistor connected in series, and the discharge circuit is connected in parallel to the output end of the power device. It is mainly used to discharge the voltage on the output capacitor of each power circuit when shutting down. The following describes how to detect whether the switch in the discharge circuit is normal when two power circuits in the power device are connected in series.

[0077] See also Figure 3 , which is a schematic diagram of the series connection of output ends of another power device provided in an embodiment of the present application.

[0078] The power device 1000 provided in the embodiment of the present application further includes: a discharge circuit connected between the positive output terminal Vout+ of the power device 1000 and the negative output terminal Vout- of the power device 1000. The discharge circuit includes a resistor R and a fourth switch K4 connected in series.

[0079] The controller is also used to control the fourth switch K4 to close, and when the third output voltage, the first output voltage and the second output voltage are all zero, it is determined that the fourth switch K4 is reliably turned on, otherwise the fourth switch K4 fails. That is, when the fourth switch K4 is turned on, energy discharge can be achieved, and when the fourth switch K4 fails and is not turned on, energy discharge cannot be achieved.

[0080] The power device provided in the embodiment of the present application can not only detect whether the first switch, the second switch and the third switch are normal, but also detect whether the switch of the discharge circuit is normal, that is, it can detect whether the discharge circuit can be turned on normally.

[0081] When the controller determines that the fourth switch is also normal, the fourth switch K4 is controlled to be disconnected, and the series start-up process of the power equipment is detected to be completed. The operation is performed only when the first switch, the second switch, the third switch and the fourth switch in the power equipment are detected to be normal.

[0082] See also Figure 4 , which is a schematic diagram of the parallel connection of the output ends of a power device provided in an embodiment of the present application.

[0083] The power device 1000 provided in the embodiment of the present application includes: a first power circuit 100 and a second power circuit 200, a first switch K1, a second switch K2 and a third switch K3; in addition, there is also a controller, which is not shown in the figure.

[0084] The two ends of the first switch K1 are respectively connected to the positive output end of the first power circuit 100 and the positive output end of the second power circuit 200; the two ends of the second switch K2 are respectively connected to the negative output end of the first power circuit 100 and the negative output end of the second power circuit 200; the two ends of the third switch K3 are respectively connected to the negative output end of the first power circuit 100 and the positive output end of the second power circuit 200.

[0085] In one embodiment, the positive output terminal of the first power circuit 100 serves as the positive output terminal Vout+ of the power unit 1000 , and the negative output terminal of the second power circuit 200 serves as the negative output terminal Vout− of the power unit 1000 .

[0086] The controller can control the connection mode between the output ends of the two power circuits by controlling three switches. When the first switch K1 and the second switch K2 are closed, and the third switch K3 is disconnected, the output end of the first power circuit 100 and the output end of the second power circuit 200 are in a parallel relationship, and the output voltage of the power device is equal to the voltage of any one of the power circuits. When the third switch K3 is closed, the first switch K1 and the second switch K2 are disconnected, the output end of the first power circuit 100 and the output end of the second power circuit 200 are in a series relationship, and the output voltage of the power device is the sum of the voltages of the two power circuits.

[0087] The controller is used to control the first switch K1 to close, and control the first power circuit 100 to output a preset voltage; determine the state of the first switch K1 according to the preset voltage, the second output voltage of the second power circuit, the first output voltage of the first power circuit, and the third output voltage of the power device; when the first switch K1 is normally closed, control the second switch K2 to close, and determine the state of the second switch K2 according to the preset voltage, the second output voltage, the first output voltage, and the third output voltage.

[0088] It should be understood that the first power circuit 100 and the second power circuit 200 have the same status. In the above, the first switch K1 is controlled to be closed first, and the first power circuit 100 is controlled to output a preset voltage. Similarly, the second switch K2 can also be controlled to be closed first, and the second power circuit 200 can be controlled to output a preset voltage. The working principle is also valid and will not be repeated here. It is all within the protection scope of the embodiments of the present application.

[0089] It should be understood that the power device provided in the embodiment of the present application will terminate subsequent detection and issue an alarm or perform maintenance when any switch is detected to be abnormal.

[0090] The power device provided in the embodiment of the present application can detect adhesion and normal disconnection of three switches in a scenario where two power circuits are connected in parallel. There is no need to add additional auxiliary circuits. Only by controlling the output voltage of the power circuit and performing voltage detection, it is possible to accurately detect whether each switch is normal.

[0091] Combine the following Figure 4-Figure 6 Introduce the specific detection process.

[0092] Figure 4 In the embodiment, the controller first controls the first switch K1 to close, and controls the first power circuit 100 to output a preset voltage. It should be understood that the controller can specifically send a driving signal to the first power circuit 100 to control the switch tube in the first power circuit 100, so that the first power circuit 100 outputs a preset voltage.

[0093] Specifically, the controller is used to control the output voltage of the first power circuit to be a preset voltage V 1 , the first output voltage V is detected A and the third output voltage V T Both with the preset voltage V 1 If the first output voltage is consistent with the preset voltage, it is judged that the first switch is normally closed (or the third switch is closed), otherwise the first switch is abnormal, that is, it is not closed. For example, when the first output voltage is consistent with the preset voltage, and the first output voltage and the third output voltage are both zero, it is judged that the first switch K1 is not closed, that is, K1 refuses to move and is still in the disconnected state.

[0094] It should be understood that when all switches are not controlled, the default state is the open state. Controlling the switch means that the controller issues relevant instructions to the switch, for example, the controller controls the first switch to close, that is, the controller issues a closing instruction to the first switch.

[0095] The detection process described in the above text can be found in Table 3.

[0096] Table 3

[0097] Output voltage relationship Relay Status Test results <![CDATA[V A ≈V T ≈V 1 , and V A ≈0]]> K1 or K3 is closed normal <![CDATA[V A ≈V 1 , and V B ≈V T ≈0]]> K1 refuses to move Fault

[0098] The controller controls the output voltage of the second power circuit to be a preset voltage, and determines the state of the switch according to Table 4.

[0099] Table 4

[0100] Output voltage relationship Relay Status Test results <![CDATA[V A ≈V B ≈V T ≈V 1 ]]> K1 is closed, K3 is disconnected normal <![CDATA[V T ≈2V 1 , and V A ≈V B ]]> K1 refuses to move, K3 closes Fault

[0101] When the controller controls the first power circuit and the second power circuit to output the preset voltage, if the first output voltage, the second output voltage and the third output voltage are all consistent with the preset voltage, it is determined that the first switch K1 is normally closed and the third switch K3 is normally disconnected, which is a normal state. When the third output voltage is equal to 2 times the preset voltage and the first output voltage is equal to the second output voltage, it is determined that the first switch K1 is abnormally refused to operate and the third switch K3 is abnormally closed.

[0102] See also Figure 5, which is a schematic diagram of parallel connection of power devices provided in an embodiment of the present application.

[0103] Figure 5 In the embodiment, a first capacitor C1 is connected between the positive output terminal and the negative output terminal of the first power circuit 100, a second capacitor C2 is connected between the positive output terminal and the negative output terminal of the second power circuit 200, and a third capacitor C3 is connected between the positive output terminal Vout+ and the negative output terminal Vout- of the power device.

[0104] The controller controls the second switch K2 to be attracted. Since the voltages of the first capacitor C1, the second capacitor C2 and the third capacitor C3 are all near the preset voltage before the second switch K2 is attracted, the process of attracting the second switch K2 will not cause electric shock or sparking to each switch, thereby effectively protecting the safety of the switch.

[0105] See also Figure 6 , this figure is a schematic diagram of a power device provided in an embodiment of the present application including a discharge circuit and connected in parallel.

[0106] The power device also includes a discharge circuit, which includes a resistor R and a fourth switch K4 connected in series. The discharge circuit is connected in parallel to the positive output terminal and the negative output terminal of the power device; the controller controls the fourth switch K4 in the discharge circuit to close. For the accuracy of the detection, after a delay setting time, each voltage can be detected according to Table 5, and it can be determined whether each switch is normal.

[0107] Table 5

[0108] Output voltage relationship Relay Status Test results <![CDATA[V T ≈V A ≈0, and V B ≈V 1 ]]> K1 is closed, K2 is not closed Fault <![CDATA[V T ≈V A ≈V B ≈0]]> K1 is closed, K2 is closed normal <![CDATA[V T ≈V A ≈V B ≈V 1 ]]> Discharge circuit abnormality Fault

[0109] The controller is further configured to control the fourth switch K4 to close after controlling the second switch K2 to close, according to the preset voltage V 1 , the second output voltage V B , the first output voltage V A and the third output voltage V T Determine whether the second switch K2 is normal.

[0110] The controller is used to control the second switch K2 to be closed, the fourth switch K4 to be closed, and the first output voltage V A , the second output voltage V B and the third output voltage V T All are zero, and it is determined that the fourth switch, the first switch K1 and the second switch K2 are all normal.

[0111] When the controller detects that K1, K2, K3 and K4 are all normal, K4 is disconnected and the parallel start-up process of the power equipment is completed.

[0112] In addition, in one embodiment, for the detection of parallel starters, when the first switch K1 is normally closed, after closing K2, the output voltage of any one power circuit can be raised to determine whether the output voltage of another power circuit and the output voltage of the power device are raised. If they are raised, it indicates that the switch is normal. Otherwise, it indicates that the switch is abnormal. Specifically, the controller is also used to raise the output voltage of the second power circuit or the output voltage of the first power circuit after controlling the second switch to close, and determine whether the second switch is normal based on the preset voltage, the second output voltage, the first output voltage and the third output voltage.

[0113] The power device provided in the embodiment of the present application can detect the adhesion fault of each switch without increasing the hardware cost of the detection auxiliary circuit. It can also realize the decoupling of the switch sticking detection and the discharge circuit, improve the robustness of the power device, and have high reliability. Moreover, by only controlling the output voltage and controlling simple switch actions through wave generation, the detection process is simplified, the detection time is shortened, and the startup speed is improved.

[0114] Based on a power device provided in the above embodiment, an embodiment of the present application further provides a detection method for a power device, which is described in detail below in conjunction with the accompanying drawings.

[0115] See also Figure 7 , which is a flow chart of a method for detecting a power device provided in an embodiment of the present application.

[0116] The power device provided in the embodiment of the present application includes: a first power circuit, a second power circuit, a controller and a switch module; the first power circuit and the second power circuit are connected in series or in parallel through a switch in the switch module.

[0117] The method includes:

[0118] S601: Control at least one switch in the switch module to close, and control the first power circuit to output a preset voltage;

[0119] S602: Determine a state of at least one switch in the switch module according to a preset voltage, a first output voltage of the first power circuit, a second output voltage of the second power circuit, and a third output voltage of the power device.

[0120] The power device provided in the embodiment of the present application does not specifically limit the number of switches included in the switch module. If parallel and series connection are to be realized, at least three switches need to be set up, one switch is used to realize the series connection of the first power circuit and the second power circuit, and the other two switches are used to realize the parallel connection of the first power circuit and the second power circuit.

[0121] The embodiment of the present application does not specifically limit the number of closed switches in the controller-controlled switch module. For example, one switch may be closed to connect the output end of the first power circuit to the output end of the second power circuit in series. When the first power circuit outputs a preset voltage, if the series-connected switches are normal, the third output voltage of the power device should be equal to the preset voltage. Since the controller does not control the second power circuit to output the preset voltage, when the series-connected switches are normal, the second output voltage of the second power circuit is not equal to the preset voltage.

[0122] Therefore, the detection method of the power device provided in the embodiment of the present application can be completely controlled by software, and it is not necessary to add auxiliary hardware circuits to detect whether the switch is normal. Similarly, the controller can also control the parallel switches to close, control the first power circuit to output a preset voltage, and then detect whether the second output voltage of the second power circuit is equal to the preset voltage, and detect whether the third output voltage of the power device is equal to the preset voltage, so as to determine whether the parallel switches are normal.

[0123] The power device provided in the embodiment of the present application does not specifically limit the specific positional relationship between the first power circuit and the second power circuit, and the positions of the two are equal.

[0124] The following first introduces the switch detection when two power circuits in the power device are connected in series.

[0125] See also Figure 8 , which is a flow chart of another power device detection method provided in an embodiment of the present application.

[0126] The detection method of a power device provided in an embodiment of the present application, the power device includes: a first power circuit, a second power circuit, a first switch, a second switch and a third switch; the positive output end of the first power circuit serves as the positive output end of the power unit, and the negative output end of the second power circuit serves as the negative output end of the power device; the two ends of the first switch are respectively connected to the positive output end of the first power circuit and the positive output end of the second power circuit; the two ends of the second switch are respectively connected to the negative output end of the first power circuit and the negative output end of the second power circuit; the two ends of the third switch are respectively connected to the negative output end of the first power circuit and the positive output end of the second power circuit;

[0127] The method includes:

[0128] S701: Control the third switch to be closed, and control the first power circuit to output a preset voltage;

[0129] S702: Determine whether the first switch, the second switch and the third switch are normal according to a preset voltage, a first output voltage of the first power circuit, a second output voltage of the second power circuit and a third output voltage of the power device.

[0130] The power device provided in the embodiment of the present application can detect adhesion and normal disconnection of three switches in a scenario where two power circuits are connected in series. There is no need to add additional auxiliary circuits. Only by controlling the output voltage of the power circuit and performing voltage detection, it is possible to accurately detect whether each switch is normal.

[0131] The above is an introduction to the detection of series starting of power equipment. The following is an introduction to the detection of parallel starting of power equipment.

[0132] See also Fig. 9 , which is a flow chart of another method for detecting a power device provided in an embodiment of the present application.

[0133] The detection method of a power device provided in an embodiment of the present application, the power device includes: a first power circuit, a second power circuit, a first switch, a second switch and a third switch; the positive output end of the first power circuit serves as the positive output end of the power unit, and the negative output end of the second power circuit serves as the negative output end of the power device; the two ends of the first switch are respectively connected to the positive output end of the first power circuit and the positive output end of the second power circuit; the two ends of the second switch are respectively connected to the negative output end of the first power circuit and the negative output end of the second power circuit; the two ends of the third switch are respectively connected to the negative output end of the first power circuit and the positive output end of the second power circuit;

[0134] The method includes:

[0135] S801: Control the first switch to be closed, and control the first power circuit to output a preset voltage;

[0136] S802: Determine the state of the first switch according to the preset voltage, the second output voltage of the second power circuit, the first output voltage of the first power circuit, and the third output voltage of the power device;

[0137] S803: When the first switch is normal, determine the state of the second switch according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

[0138] The power device provided in the embodiment of the present application can detect adhesion and normal disconnection of three switches in a scenario where two power circuits are connected in series. There is no need to add additional auxiliary circuits. Only by controlling the output voltage of the power circuit and performing voltage detection, it is possible to accurately detect whether each switch is normal.

[0139] For the specific implementation and advantages of the method embodiment, please refer to the introduction of the device embodiment, which will not be repeated here.

[0140] Based on a power device and a detection method for a power device provided in the above embodiments, the embodiments of the present application further provide a charging pile, which is described in detail below.

[0141] The charging pile provided in the embodiment of the present application includes the power device introduced in the above embodiment.

[0142] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the method disclosed in the embodiment, since it corresponds to the product embodiment disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the product embodiment part.

[0143] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power device, characterized in that: include: A first power circuit, a second power circuit, a controller and a switch module; The first power circuit and the second power circuit are connected in series or in parallel via a switch in the switch module; The controller is used to control at least one switch in the switch module to close, control the first power circuit to output a preset voltage, and determine the state of at least one switch in the switch module based on the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

2. The power device according to claim 1, characterized in that The switch module includes: a first switch, a second switch and a third switch; The first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; The controller is used to control the third switch to be closed, the first switch and the second switch to be opened, and control the first power circuit to output a preset voltage; and judge the state of at least one of the first switch, the second switch and the third switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

3. The power device according to claim 3, characterized in that The controller is used to control the first power circuit to output the preset voltage, and when the first output voltage and the third output voltage are both consistent with the preset voltage and the second output voltage is zero, it is determined that the third switch is normally closed and the first switch is normally disconnected.

4. The power device according to claim 3, characterized in that The controller is used to control the first power circuit to output the preset voltage, and when the first output voltage, the second output voltage and the third output voltage are all consistent with the preset voltage, determine that the first switch and the second switch are both stuck and the third switch is not closed.

5. The power device according to claim 3, characterized in that: The controller is used to control the first power circuit to output the preset voltage, and when the first output voltage, the second output voltage and the third output voltage are all zero, determine that the third switch is normally energized and the first switch is stuck.

6. The power device according to claim 3, characterized in that The controller is used to control the first power circuit to output the preset voltage, and when the first output voltage is consistent with the preset voltage and the third output voltage and the second output voltage are both zero, determine that the third switch is not closed.

7. The power device according to any one of claims 1 to 3, characterized in that: The controller is also used to control the second power circuit to output the preset voltage when the state of the target switch in the switch module is normal, and determine the states of all switches in the switch module according to the preset voltage, the first output voltage, the second output voltage and the third output voltage.

8. The power device according to claim 7, characterized in that The controller is specifically used to control the second power circuit to output the preset voltage, and when the third output voltage is equal to twice the preset voltage, it is determined that the third switch is closed, and the first switch and the second switch are both disconnected.

9. The power device according to claim 7, characterized in that: The controller is specifically used to control the second power circuit to output the preset voltage, the first output voltage and the third output voltage are both consistent with the preset voltage, and judge that the third switch is closed, the first switch is disconnected, and the second switch is stuck.

10. The power device according to claim 8, characterized in that The power device further includes a discharge circuit, the discharge circuit includes a resistor and a fourth switch connected in series, and the discharge circuit is connected in parallel to the positive output terminal and the negative output terminal of the power device; The controller is further used to control the fourth switch to close, and when the third output voltage, the first output voltage and the second output voltage are all zero, it is determined that the fourth switch is closed normally; otherwise, it is determined that the fourth switch is invalid.

11. The power device according to claim 1, characterized in that The switch module includes: a first switch, a second switch and a third switch; The first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; The controller is used to control the first switch to close, and control the first power circuit to output a preset voltage; judge the state of the first switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device; and control the second switch to close when it is determined that the first switch is normally attracted, and judge the state of the second switch according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

12. The power device according to claim 11, characterized in that The controller is also used to control the second switch to be closed when the first switch is normally energized, thereby raising the output voltage of the second power circuit or the output voltage of the first power circuit, and judging whether the second switch is normal based on the preset voltage, the second output voltage, the first output voltage and the third output voltage.

13. The power device according to claim 11, characterized in that The power device further includes a discharge circuit, the discharge circuit includes a resistor and a fourth switch connected in series, and the discharge circuit is arranged between the positive output terminal and the negative output terminal of the power device; The controller is further used to control the fourth switch to close after controlling the second switch to close, and to determine the states of the second switch and the fourth switch according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

14. The power device according to claim 11, characterized in that The controller is specifically used to control the first power circuit to output a preset voltage, and when the first output voltage and the third output voltage are both consistent with the preset voltage, determine that the first switch or the third switch is normally closed; The controller is specifically used to control the first power circuit to output a preset voltage, and when the first output voltage is consistent with the preset voltage and the second output voltage and the third output voltage are both zero, determine that the first switch is not closed.

15. The power device according to claim 11, characterized in that The controller is specifically used to control the second power circuit to output a preset voltage, and when the first output voltage, the second output voltage, and the third output voltage are all consistent with the preset voltage, determine that the first switch is normally closed and the third switch is normally disconnected; The controller is specifically used to control the second power circuit to output a preset voltage, and when the first output voltage, the second output voltage, and the third output voltage are all consistent with the preset voltage, determine that the first switch is not closed and the third switch is normally closed.

16. The power device according to claim 13, characterized in that The controller is specifically used to control the second switch to be closed and the fourth switch to be closed, and when the first output voltage, the second output voltage and the third output voltage are all zero, it is determined that the fourth switch, the first switch and the second switch are all normal.

17. A method for detecting a power device, characterized in that: The power device comprises: a first power circuit, a second power circuit, a controller and a switch module; the first power circuit and the second power circuit are connected in series or in parallel through a switch in the switch module; The method includes: Controlling at least one switch in the switch module to close, and controlling the first power circuit to output a preset voltage; The state of at least one switch in the switch module is determined according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

18. The detection method according to claim 17, characterized in that: The switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; Determining the state of at least one switch in the switch module according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit, and the third output voltage of the power device specifically includes: Control the third switch to be closed, the first switch and the second switch to be opened, and control the first power circuit to output a preset voltage; and judge the state of at least one of the first switch, the second switch and the third switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit and the third output voltage of the power device.

19. The detection method according to claim 17, characterized in that: The switch module includes: a first switch, a second switch and a third switch; the first power circuit and the second power circuit are connected in parallel through the first switch and the second switch; the first power circuit and the second power circuit are connected in series through the third switch; Determining the state of at least one switch in the switch module according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit, and the third output voltage of the power device specifically includes: Controlling the first switch to close, controlling the first power circuit to output a preset voltage; judging the state of the first switch according to the preset voltage, the first output voltage of the first power circuit, the second output voltage of the second power circuit, and the third output voltage of the power device; When it is determined that the first switch is normally closed, the state of the second switch is determined according to the preset voltage, the second output voltage, the first output voltage and the third output voltage.

20. A charging pile, characterized in that: A power device comprising any one of claims 1-16.

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