A charging module, charging control method and device

Abstract

The present invention discloses a charging module, including: a voltage conversion circuit, n-1 first double-contact relays and n-1 second double-contact relays; wherein n is a positive integer greater than or equal to 2; the voltage conversion circuit includes n conversion outputs; the present invention utilizes the setting of the first double-contact relay and the second double-contact relay, and can control the series and parallel forms of the DC / DC conversion circuit output by controlling the conduction of the first double-contact relay and the second double-contact relay, thereby widening the output voltage range of the charging module; and the first double-contact relay and the second double-contact relay can implement interlocking logic, avoiding the risk of short circuit of the busbar when the relay is stuck, and ensuring the safe use of the charging module. In addition, the present invention also discloses a charging control method and device, which also have the above-mentioned beneficial effects.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a charging module, a charging control method and a charging device. Background Art

[0002] At present, since the charging voltages required by different loads are mostly different, in order to meet the charging voltage requirements of different loads, the charging module needs to achieve a wide voltage range output.

[0003] In the prior art, in order to achieve a wide voltage range output of the charging module, the series and parallel forms of the voltage conversion circuit output in the charging module are often switched by switching a single-contact relay; however, since the switching of the relay may cause adhesion, the existing single-contact relay will cause a bus short circuit when adhesion occurs, causing device damage. Therefore, how to avoid the risk of bus short circuit and ensure the safe use of the charging module while ensuring the wide voltage range output of the charging module is an urgent problem to be solved today. Summary of the invention

[0004] The object of the present invention is to provide a charging module, a charging control method and a device, so as to avoid the risk of bus short circuit and ensure the safe use of the charging module on the basis of ensuring the wide voltage range output of the charging module.

[0005] In order to solve the above technical problems, the present invention provides a charging module, comprising: a voltage conversion circuit, n-1 first double-contact relays and n-1 second double-contact relays; wherein n is a positive integer greater than or equal to 2;

[0006] The voltage conversion circuit includes n conversion outputs, the positive output end of the i-th conversion output is connected to the positive output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th first double-contact relay, the negative output end of the i-th conversion output is connected to the negative output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th second double-contact relay; the second static contact of the i-th first double-contact relay is connected to the second static contact of the i-th second double-contact relay; i is a positive integer less than or equal to n-1.

[0007] Optionally, when the voltage conversion circuit is specifically a DC / DC conversion circuit or an AC / DC conversion circuit, the charging module further includes: a third double-contact relay, a first switch tube, a first capacitor and an inductor;

[0008] Among them, the second static contact of the first first double-contact relay is connected to the second static contact of the first second double-contact relay through the moving contact and the second static contact of the third double-contact relay, the moving contact and the second static contact of the third double-contact relay are connected through the first switch tube, the positive output end of the first conversion output and the common end connected to the first first double-contact relay are connected to the positive output end of the nth conversion output and the common end connected to the nth first double-contact relay through the inductor and the first capacitor in sequence; the common end of the inductor connected to the first capacitor and the common end of the positive output end of the nth conversion output connected to the first capacitor are respectively used as the positive output end and the negative output end of the charging module, which are used to charge the connected load.

[0009] Optionally, the charging module further includes: n-1 first diodes and n-1 second diodes;

[0010] Among them, the positive output end of the i-th conversion output is respectively connected to the first static contact of the i-th first double-contact relay and the cathode of the i-th first diode, and the positive output end of the i+1-th conversion output is respectively connected to the moving contact of the i-th first double-contact relay and the anode of the i-th first diode; the negative output end of the i-th conversion output is respectively connected to the moving contact of the i-th second double-contact relay and the cathode of the i-th second diode, and the negative output end of the i+1-th conversion output is respectively connected to the first static contact of the i-th second double-contact relay and the anode of the i-th second diode.

[0011] Optionally, the charging module further includes: n second capacitors;

[0012] Among them, the first end of the jth second capacitor is connected to the positive output end of the jth conversion output, and the first end of the jth second capacitor is connected to the negative output end of the jth conversion output; j is a positive integer less than or equal to n.

[0013] Optionally, when the voltage conversion circuit is specifically a DC / DC conversion circuit, the voltage conversion circuit includes: m first switch circuits, m second switch circuits, m first transformers, m second transformers, n first rectifier circuits, and n second rectifier circuits; wherein each of the first transformers and the second transformers includes n secondary windings, m is a positive integer greater than or equal to 2, and each of the first switch circuits and the second switch circuits includes at least one bridge arm, and the bridge arm includes two second switch tubes connected in series;

[0014] The first input end of each of the first switch circuits is connected to the positive pole of the DC bus, the second input end of each of the first switch circuits and the first input end of each of the second switch circuits are grounded, and the second input end of each of the second switch circuits is connected to the negative pole of the DC bus; the first output end of each of the first switch circuits is connected one-to-one with the first end of the primary winding of the corresponding first transformer, the second output end of each of the first switch circuits is connected one-to-one with the second end of the primary winding of the corresponding first transformer, the first output end of each of the second switch circuits is connected one-to-one with the first end of the primary winding of the corresponding second transformer, and the second output end of each of the second switch circuits is connected one-to-one with the second end of the primary winding of the corresponding second transformer;

[0015] The second end of the jth secondary winding of the kth first transformer is connected to the first end of the jth secondary winding of the k+1th first transformer, the first end of the jth secondary winding of the 1st first transformer is connected to the first input end of the jth first rectifier circuit, and the second end of the jth secondary winding of the mth first transformer is connected to the second input end of the jth first rectifier circuit; the second end of the jth secondary winding of the kth second transformer is connected to the first end of the jth secondary winding of the k+1th second transformer, the first end of the jth secondary winding of the 1st second transformer is connected to the first input end of the jth second rectifier circuit, and the second end of the jth secondary winding of the mth second transformer is connected to the second input end of the jth second rectifier circuit; k is a positive integer less than or equal to m-1, and j is a positive integer less than or equal to n;

[0016] The common end connected to the positive output end of the jth first rectifier circuit and the positive output end of the jth second rectifier circuit serves as the positive output end of the jth conversion output, and the common end connected to the negative output end of the jth first rectifier circuit and the negative output end of the jth second rectifier circuit serves as the negative output end of the jth conversion output.

[0017] The present invention also provides a charging control method, which is applied to the charging module as described above, comprising:

[0018] Get the target charging voltage;

[0019] Determining a target operating mode of the charging module according to the target charging voltage; wherein the target operating mode is a series mode or a parallel mode;

[0020] According to the target working mode, the first double-contact relay and the second double-contact relay in the charging module are controlled so that the charging module charges the load under the target working mode.

[0021] Optionally, determining the working mode of the charging module according to the target charging voltage includes:

[0022] Determining whether the target charging voltage is greater than a switching voltage threshold;

[0023] If yes, determining that the target operating mode is the series mode;

[0024] If not, the target operating mode is determined to be the parallel mode.

[0025] Optionally, when the charging module includes a third double-contact relay and a first switch tube, controlling the first double-contact relay and the second double-contact relay in the charging module according to the target working mode includes:

[0026] Determining whether the charging module is in operation;

[0027] If not, when the target operating mode is the series mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the second static contact is controlled to be turned on; when the target operating mode is the parallel mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the first static contact is controlled to be turned on;

[0028] If so, the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube are controlled according to the current working state of the charging module and the target working mode.

[0029] Optionally, the current working mode and the target working mode of the charging module control the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube, including:

[0030] Determining whether the current operating mode of the charging module is the same as the target operating mode;

[0031] If the operating mode is the same as the target operating mode, maintaining the conducting state of the first double-contact relay, the second double-contact relay and the third double-contact relay;

[0032] If it is different from the target working mode, when the target working mode is the series mode, the switch tube drive of the voltage conversion circuit in the charging module is turned off, and the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch on and connect to the second static contact; the first switch tube is driven and controlled to switch on at a fixed switching frequency and a duty cycle increasing from 0 to 1 in a preset step; the moving contact of the third double-contact relay is controlled to switch on and connect to the second static contact, and the drive of the first switch tube is turned off after a preset time;

[0033] If it is different from the target operating mode, then when the target operating mode is the parallel mode, the moving contact of the third double-contact relay is controlled to switch and connect to the first static contact, and when the difference between the voltage of any conversion output of the DC / DC conversion circuit and the voltage of the first capacitor of the charging module is greater than the preset control voltage, the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch and connect to the first static contact.

[0034] The present invention further provides a charging control device, which is applied to the charging module as described above, comprising:

[0035] An acquisition unit, used for acquiring a target charging voltage;

[0036] A determination unit, configured to determine a target operating mode of the charging module according to the target charging voltage; wherein the target operating mode is a series mode or a parallel mode;

[0037] The control unit is used to control the first double-contact relay and the second double-contact relay in the charging module according to the target working mode, so that the charging module charges the load in the target working mode.

[0038] A charging module provided by the present invention comprises: a voltage conversion circuit, n-1 first double-contact relays and n-1 second double-contact relays; wherein n is a positive integer greater than or equal to 2; the voltage conversion circuit comprises n conversion outputs, the positive output end of the i-th conversion output is connected to the positive output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th first double-contact relay, the negative output end of the i-th conversion output is connected to the negative output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th second double-contact relay; the second static contact of the i-th first double-contact relay is connected to the second static contact of the i-th second double-contact relay; i is a positive integer less than or equal to n-1;

[0039] It can be seen that the present invention utilizes the setting of the first double-contact relay and the second double-contact relay, and can control the series and parallel forms of the voltage conversion circuit output by controlling the conduction of the first double-contact relay and the second double-contact relay, thereby widening the output voltage range of the charging module; and the first double-contact relay and the second double-contact relay can realize interlocking logic, avoiding the risk of short circuit of the busbar when the relay is stuck, and ensuring the safe use of the charging module. In addition, the present invention also provides a charging control method and device, which also have the above-mentioned beneficial effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0041] Figure 1 A schematic diagram of the structure of a charging module provided by an embodiment of the present invention;

[0042] Figure 2 A flow chart of a charging control method provided by an embodiment of the present invention;

[0043] Figure 3 A circuit diagram of an intermediate process of switching working modes in another charging control method provided by an embodiment of the present invention;

[0044] Figure 4 A circuit diagram of a series mode in another charging control method provided by an embodiment of the present invention;

[0045] Figure 5 A circuit diagram of a parallel mode in another charging control method provided by an embodiment of the present invention;

[0046] Figure 6 This is a structural block diagram of a charging control device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please refer to Figure 1, Figure 1 This is a schematic diagram of the structure of a charging module provided by an embodiment of the present invention. The charging module may include: a voltage conversion circuit 10, n-1 first double-contact relays 20 and n-1 second double-contact relays 30; wherein n is a positive integer greater than or equal to 2;

[0049] The voltage conversion circuit 10 includes n conversion outputs, the positive output end of the i-th conversion output is connected to the positive output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th first double-contact relay 20, and the negative output end of the i-th conversion output is connected to the negative output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th second double-contact relay 30; the second static contact of the i-th first double-contact relay 20 is connected to the second static contact of the i-th second double-contact relay 30; i is a positive integer less than or equal to n-1.

[0050] Specifically, the voltage conversion circuit 10 in this embodiment can convert the input electric energy into the electric energy of the required voltage output by each conversion output. The specific circuit structure of the voltage conversion circuit 10 in this embodiment can be set by the designer according to the practical scenario and user needs. For example, it can be implemented in the same or similar manner as the voltage conversion circuit 10 in the prior art. For example, the voltage conversion circuit 10 can be specifically a DC / DC converter to convert the DC power of the DC bus into the DC power of the required voltage output by each conversion output; the voltage conversion circuit 10 can also be specifically an AC / DC converter to convert the input AC power into the DC power of the required voltage output by each conversion output; the voltage conversion circuit 10 can also be specifically a DC / AC converter or an AC / AC converter. As long as it is ensured that the voltage conversion circuit 10 can convert the output electric energy into the electric energy of each conversion output, so as to use the first double-contact relay 20 and the second double-contact relay 30 to switch the series and parallel forms of each conversion output to realize the wide voltage range output of the charging module, this embodiment does not impose any restrictions on this.

[0051] It can be understood that, in this embodiment, the setting of the first double-contact relay 20 and the second double-contact relay 30 is utilized to control the series and parallel forms of the output of the voltage conversion circuit 10 by controlling the conduction of the first double-contact relay 20 and the second double-contact relay 30, thereby widening the output voltage range of the charging module; and in this embodiment, the interlocking logic of the first double-contact relay 20 and the second double-contact relay 30 is utilized to avoid the risk of short circuit of the bus when the relays are stuck.

[0052] Specifically, the first static contact and the second static contact of the double-contact relay (such as the first double-contact relay 20 and the second double-contact relay 30) in the present embodiment can be a normally open contact and a normally closed contact, respectively. The specific circuit connection of the first double-contact relay 20 and the second double-contact relay 30 in the present embodiment can be set by the designer. For example, when the first static contact is a normally open contact and the second static contact is a normally closed contact, the positive output end of the i-th conversion output can be connected to the positive output end of the i+1-th conversion output in sequence through the normally open contact and the moving contact of the i-th first double-contact relay 20, and the negative output end of the i-th conversion output can be connected to the negative output end of the i+1-th conversion output in sequence through the moving contact and the normally open contact of the i-th second double-contact relay 30; the normally closed contact of the i-th first double-contact relay 20 is connected to the normally closed contact of the i-th second double-contact relay 30; such as Figure 1 As shown, when n is 2, the positive output terminal of the first conversion output can be connected to the normally open contact (off) of the first double-contact relay 20 (S1), the moving contact of the first double-contact relay 20 is connected to the positive output terminal of the second conversion output, the negative output terminal of the first conversion output can be connected to the moving contact of the second double-contact relay 30 (S2), and the normally open contact of the second double-contact relay 30 is connected to the negative output terminal of the second conversion output.

[0053] Furthermore, when the electric energy output by each conversion output of the voltage conversion circuit 10 is direct current, that is, when the voltage conversion circuit 10 is specifically a DC / DC conversion circuit or an AC / DC conversion circuit, in order to avoid the influence of the voltage change on the load or the output capacitance when the charging module switches the output of the voltage conversion circuit 10 from parallel to series during operation, the second static contacts of the n-1 first double-contact relays 20 in this embodiment may not be directly connected to the second static contact of the corresponding second double-contact relay 30, such as one or more of the n-1 first double-contact relays 20 may be connected to the second static contact of the corresponding second double-contact relay 30 through a third double-contact relay and a first switch tube connected in parallel; for example, the charging module provided in this embodiment may also include a third double-contact relay, a first switch tube, a first capacitor and an inductor (such as Figure 1L1); wherein, the second static contact of the first first double-contact relay 20 is connected to the second static contact of the first second double-contact relay 30 through the moving contact and the second static contact of the third double-contact relay, the moving contact and the second static contact of the third double-contact relay are connected through the first switch tube, the positive output end of the first conversion output and the common end connected to the first first double-contact relay 20 are connected to the positive output end of the nth conversion output and the common end connected to the nth first double-contact relay 20 through the inductor and the first capacitor in turn; the common end of the inductor connected to the first capacitor and the common end of the positive output end of the nth conversion output connected to the first capacitor are respectively used as the positive output end and the negative output end of the charging module, which are used to charge the connected load. Figure 1 As shown, when n is 2, the normally closed contact (on) of the first double-contact relay 20 can be connected to the normally closed contact of the third double-contact relay, the moving contact of the third double-contact relay (S3) can be connected to the normally closed contact of the second double-contact relay 30, and the two ends of the first switch tube (Q1) can be connected one-to-one to the moving contact and the normally closed contact of the third double-contact relay, so that when the two conversion outputs of the voltage conversion circuit 10 are switched from parallel to series, the two first capacitors (C3 and C4) can be charged in a chopping manner by controlling the conduction of the first switch tube to avoid the impact current on the first capacitors; for example, when the parallel connection is switched to the series connection, Figure 1 When the output capacitors (C1 and C2) of the two conversion outputs are connected in series, the voltage can be considered to be 2U, and the total voltage on C3 and C4 is U ALL The voltage is U. If S1, S2 and S3 are directly closed, the voltage difference between the two is 2U-U=U, which will generate a very large impact current and damage C3 and C4.

[0054] Correspondingly, the charging module provided in this embodiment may also include n second capacitors, each of which may be connected in parallel to the two ends of a conversion output of the corresponding voltage conversion circuit 10, that is, the first end of the jth second capacitor is connected to the positive output end of the jth conversion output of the voltage conversion circuit 10, and the first end of the jth second capacitor is connected to the negative output end of the jth conversion output of the voltage conversion circuit 10; j is a positive integer less than or equal to n. Correspondingly, when each conversion output of the voltage conversion circuit 10 includes a corresponding output capacitor, the second capacitor may not be provided.

[0055] Specifically, the charging module provided in this embodiment may also include n-1 first diodes and n-1 second diodes; wherein, the positive output end of the i-th conversion output is respectively connected to the first static contact of the i-th first double-contact relay 20 and the cathode of the i-th first diode, and the positive output end of the i+1-th conversion output is respectively connected to the moving contact of the i-th first double-contact relay 20 and the anode of the i-th first diode; the negative output end of the i-th conversion output is respectively connected to the moving contact of the i-th second double-contact relay 30 and the cathode of the i-th second diode, and the negative output end of the i+1-th conversion output is respectively connected to the first static contact of the i-th second double-contact relay 30 and the anode of the i-th second diode.

[0056] Correspondingly, when the charging module includes a third double-contact relay, the charging module may further include a third diode; wherein the cathode of the third diode may be connected to the second static contact of the first first double-contact relay 20, and the anode of the third diode may be connected to the second static contact of the first second double-contact relay 30. Figure 1 As shown, when n is 2, the first diode (D1), the second diode (D2) and the third diode (D3) can be connected in parallel with S1, S2 and S3 respectively.

[0057] Specifically, the charging module provided in this embodiment may further include a fourth diode (such as Figure 1 D4 in the figure); wherein the positive output terminal of the charging module can be connected to the load through a fourth diode to avoid current reverse, such as the common end of the inductor connected to the first capacitor can be connected to the anode of the fourth diode, and the cathode of the fourth diode can be connected to the load as the positive output terminal of the charging module.

[0058] It should be noted that if Figure 1 As shown, when the voltage conversion circuit 10 in this embodiment is specifically a DC / DC conversion circuit, it may include: m first switch circuits 11, m second switch circuits 12, m first transformers 13, m second transformers 14, n first rectifier circuits 15 and n second rectifier circuits 16; wherein each of the first transformer 13 and the second transformer 14 includes n secondary windings, and m is a positive integer greater than or equal to 2, such as Figure 1 As shown, m can be 2; each of the first switch circuit 11 and the second switch circuit 12 includes at least one bridge arm, and the bridge arm includes two second switch tubes connected in series; the first input end of each first switch circuit 11 is connected to the positive electrode of the DC bus (PBUS + ), the second input end of each first switch circuit 11 and the first input end of each second switch circuit 12 are grounded (i.e., the midpoint of the DC bus), and the second input end of each second switch circuit 12 is connected to the negative pole (NBUS) of the DC bus. -) are connected; the first output end of each first switch circuit 11 is connected one-to-one with the first end of the primary winding of the corresponding first transformer 13, the second output end of each first switch circuit 11 is connected one-to-one with the second end of the primary winding of the corresponding first transformer 13, the first output end of each second switch circuit 12 is connected one-to-one with the first end of the primary winding of the corresponding second transformer 14, and the second output end of each second switch circuit 12 is connected one-to-one with the second end of the primary winding of the corresponding second transformer 14; the second end of the jth secondary winding of the kth first transformer 13 is connected to the first end of the jth secondary winding of the k+1th first transformer 13, the first end of the jth secondary winding of the 1st first transformer 13 is connected to the first input end of the jth first rectifier circuit 15, the second end of the jth secondary winding of the mth first transformer 13 is connected to the first input end of the jth first rectifier circuit 15, and the second end of the jth secondary winding of the mth first transformer 13 is connected to the first input end of the jth first rectifier circuit 15. The second end of the jth secondary winding of the kth second transformer 14 is connected to the first end of the jth secondary winding of the k+1th second transformer 14, the first end of the jth secondary winding of the 1st second transformer 14 is connected to the first input end of the jth second rectifier circuit 16, and the second end of the jth secondary winding of the mth second transformer 14 is connected to the second input end of the jth second rectifier circuit 16; k is a positive integer less than or equal to m-1, and j is a positive integer less than or equal to n; the common end of the positive output end of the jth first rectifier circuit 15 and the positive output end of the jth second rectifier circuit 16 is connected as the positive output end of the jth conversion output, and the common end of the negative output end of the jth first rectifier circuit 15 and the negative output end of the jth second rectifier circuit 16 is connected as the negative output end of the jth conversion output.

[0059] Correspondingly, in this embodiment, the one-to-one connection mode between the first output terminal and the second output terminal of each switch circuit (i.e., the first switch circuit 11 or the second switch circuit 12) and the first end and the second end of the primary winding of a corresponding transformer (i.e., the first transformer 13 or the second transformer 14) can be set by the designer. For example, the first output terminal and the second output terminal of each switch circuit can be directly connected one-to-one with the first end and the second end of the primary winding of a corresponding transformer; Figure 1 As shown, the first output end of each switch circuit can also be connected one-to-one with the first end of the primary winding of a corresponding transformer through an inductor to filter the output of the switch circuit, that is, the voltage conversion circuit 10 provided in this embodiment can also include 2m inductors, the first output end of each first switch circuit 11 is connected one-to-one with the first end of the primary winding of the corresponding first transformer 13 through a corresponding inductor, and the first output end of each second switch circuit 12 is connected one-to-one with the first end of the primary winding of the second transformer 14 through a corresponding inductor; as shown Figure 1 As shown, the second output end of each switch circuit can also be connected one-to-one with the second end of the primary winding of a corresponding transformer through a corresponding capacitor to filter the output of the switch circuit, that is, the voltage conversion circuit 10 provided in this embodiment can also include 2m capacitors, the second output end of each first switch circuit 11 is connected one-to-one with the second end of the primary winding of the corresponding first transformer 13 through a corresponding capacitor, and the second output end of each second switch circuit 12 is connected one-to-one with the second end of the primary winding of the second transformer 14 through a corresponding capacitor. As long as each switch circuit can convert the respective input direct current into the corresponding alternating current and output it to the primary winding of the respective connected transformer, this embodiment does not impose any restrictions on this.

[0060] Specifically, each of the first switch circuit 11 and the second switch circuit 12 in this embodiment can be a full-bridge circuit including two bridge arms or a half-bridge circuit including one bridge arm, such as a full-bridge circuit or a half-bridge circuit consisting of only switch tubes connected. This embodiment does not impose any limitation on this.

[0061] The present embodiment does not limit the specific circuit structures of the first rectifier circuit 15 and the second rectifier circuit 16. Figure 1 As shown, each of the first rectifier circuit 15 and the second rectifier circuit 16 can be a full-wave rectifier bridge circuit composed of four diodes. As long as the first rectifier circuit 15 and the second rectifier circuit 16 can convert the received alternating current into corresponding direct current and output it through two output terminals (i.e., the positive output terminal and the negative input terminal), this embodiment does not impose any restrictions on this.

[0062] Correspondingly, such as Figure 1 As shown, two output ends of each of the first rectifier circuit 15 and the second rectifier circuit 16 may be connected in parallel with a corresponding capacitor, respectively, so as to filter the outputs of the first rectifier circuit 15 and the second rectifier circuit 16 .

[0063] In this embodiment, the embodiment of the present invention utilizes the setting of the first double-contact relay 20 and the second double-contact relay 30, and can control the series and parallel forms of the voltage conversion circuit 10 output by controlling the conduction of the first double-contact relay 20 and the second double-contact relay 30, thereby widening the output voltage range of the charging module; and the first double-contact relay 20 and the second double-contact relay 30 can implement interlocking logic, avoiding the risk of short circuit of the bus when the relays are stuck, thereby ensuring the safe use of the charging module.

[0064] Please refer to Figure 2 , Figure 2 This is a flow chart of a charging control method provided by an embodiment of the present invention. The method is applied to the charging module provided by the above embodiment and may include:

[0065] Step 101: Obtain a target charging voltage.

[0066] The target charging voltage in this step may be a supply voltage when the charging module supplies power to the load.

[0067] Specifically, the specific method for obtaining the target charging voltage in this step can be set by the designer according to practical scenarios and user needs. For example, the processor in the charging module can directly receive the target charging voltage sent by the controller; the processor can also determine the target charging voltage based on the charging demand information of the load (such as charging current and charging power, etc.), and this embodiment does not impose any restrictions on this.

[0068] Step 102: Determine a target operating mode of the charging module according to a target charging voltage; wherein the target operating mode is a series mode or a parallel mode.

[0069] It is understandable that the target working mode in this step may be the working mode that the charging module is to switch to. The target working mode may be a series mode in which the voltage conversion circuit in the charging module outputs in series or a parallel mode in which the voltage conversion circuit outputs in parallel.

[0070] Specifically, the specific manner in which the processor in the charging module in this embodiment determines the target operating mode of the charging module according to the target charging voltage can be set by the designer according to practical scenarios and user needs. For example, the processor can directly determine the target operating mode of the charging module by comparing the target charging voltage with the switching voltage threshold to avoid the output power failure of the charging module during the output form switching process of the voltage conversion circuit, resulting in the stop charging of the load, such as the BMS (battery management system) protection of the battery in the load stopping charging due to the output power failure; for example, in this step, the processor can determine whether the target charging voltage is greater than the switching voltage threshold; if it is greater than the switching voltage threshold, the target operating mode is determined to be the series mode; if it is less than or equal to the switching voltage threshold, the target operating mode is determined to be the parallel mode.

[0071] Step 103: According to the target working mode, control the first double-contact relay and the second double-contact relay in the charging module, so that the charging module charges the load in the target working mode.

[0072] It can be understood that in this step, the processor in the charging module can control the conduction of the first double-contact relay and the second double-contact relay in the charging module according to the determined target operating mode, so as to control the charging module to charge the load under the target operating mode.

[0073] Correspondingly, when the charging module includes a third double-contact relay and a first switch tube, in this step, the processor can control the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube in the charging module according to the enabled state of the charging module (such as the running state or the standby state), the current working mode and the target working mode, so that the charging module charges the load in the target working mode. For example, the processor can determine whether the charging module is in the running state; if it is in the standby state, when the target working mode is the series mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the second static contact is controlled; when the target working mode is the parallel mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the first static contact is controlled; if it is in the running state, the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube are controlled according to the current working state and the target working mode of the charging module.

[0074] That is to say, when the charging module is in the standby state, the processor can directly control the first double-contact relay, the second double-contact relay and the third double-contact relay to switch the output form of the voltage conversion circuit. Figure 1 Taking the charging module shown in the figure as an example, the first static contact and the second static contact of the double-contact relay are respectively a normally open contact and a normally closed contact. When the processor determines that the target working mode is the series mode, it can control the connection between the moving contact and the normally closed contact of the first double-contact relay, the second double-contact relay and the third double-contact relay. Figure 4 As shown, the voltage conversion circuit outputs electric energy in series to power the load; when the processor determines that the target working mode is the parallel mode, it can control the connection between the moving contacts and the normally open contacts of the first double-contact relay, the second double-contact relay and the third double-contact relay, as shown in FIG. Figure 5 As shown, the voltage conversion circuit outputs electrical energy in parallel to supply power to the load.

[0075] Specifically, when the charging module is in operation, the processor controls the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube according to the current working state and the target working mode of the charging module. The specific method can be set by the designer. For example, the processor can determine whether the current working mode of the charging module is the same as the target working mode; if it is the same as the target working mode, the conduction state of the first double-contact relay, the second double-contact relay and the third double-contact relay is maintained to keep the current working mode unchanged.

[0076] Correspondingly, if the current working mode is different from the target working mode, there can be two situations respectively. When the target working mode is the series mode, that is, when the working mode of the charging module needs to be switched from the parallel mode to the series mode, the processor can turn off the switch tube drive of the voltage conversion circuit in the charging module, and control the moving contacts of the first double-contact relay and the second double-contact relay to switch on and connect to the second static contact; drive and control the first switch tube to switch on at a fixed switching frequency and a duty cycle increasing from 0 to 1 in a preset step; control the moving contact of the third double-contact relay to switch on and connect to the second static contact, and turn off the drive of the first switch tube after a preset time; and restore the switch tube drive of the voltage conversion circuit in the charging module. Figure 1 Taking the charging module shown in the figure as an example, when the working mode of the charging module needs to be switched from the parallel mode to the series mode, the processor can first turn off the switch tube drive of the voltage conversion circuit in the charging module, control S1 and S2 to switch from normally open contacts to normally closed contacts, and S3 remains in the normally open contact (such as Figure 3 As shown); then drive and control Q1 to turn on with a fixed switching frequency and a duty cycle increasing from 0 to 1 in a preset step size. At this time, C1, C2, D1, D2, D3, Q1, L1, C3 and C4 can form a BUCK circuit (step-down circuit). When Q1 is turned on, C1 and C2 are connected in series to charge C3 and C4 through L1. When Q1 is turned off, the current on L1 flows through C3, C4, D2, S2 normally closed contact, D3, S1 normally closed contact and D1; then S3 switches from a normally open contact to a normally closed contact (as shown Figure 4 As shown), and after a preset delay time, the drive of Q1 is turned off to ensure that the contact switching of S3 can be completed.

[0077] Correspondingly, when the target working mode is the parallel mode, that is, when the working mode of the charging module needs to be switched from the series mode to the parallel mode, the processor controls the moving contact of the third double-contact relay to switch and connect to the first static contact, and when the difference between the voltage of any conversion output of the voltage conversion circuit and the voltage of the first capacitor of the charging module is greater than the preset control voltage, the processor controls the moving contacts of the first double-contact relay and the second double-contact relay to switch and connect to the first static contact. Furthermore, the processor may turn off the switch tube drive of the voltage conversion circuit in the charging module before controlling the moving contact of the third double-contact relay to switch and connect to the first static contact; and restore the switch tube drive of the voltage conversion circuit in the charging module after controlling the moving contacts of the first double-contact relay and the second double-contact relay to switch and connect to the first static contact. Figure 1 Taking the charging module shown in the figure as an example, when the working mode of the charging module needs to be switched from the series mode to the parallel mode, the processor can first turn off the switch tube drive of the voltage conversion circuit in the charging module, control S3 to switch from the normally closed contact to the normally open contact, and S1 and S2 remain in the normally closed contact (such as Figure 3 As shown); when the voltage U1 on C1 or the voltage U2 on C2 is greater than U ALL When the voltage is above -10V, control S1 and S2 to switch from normally closed contacts to normally open contacts (such as Figure 5 shown).

[0078] In this embodiment, the embodiment of the present invention controls the first double-contact relay and the second double-contact relay in the charging module according to the target operating mode, so that the charging module charges the load under the target operating mode, thereby realizing the control of the series and parallel forms of the voltage conversion circuit output, and widening the output voltage range of the charging module; and the first double-contact relay and the second double-contact relay can realize interlocking logic, avoiding the risk of short circuit of the bus when the relays are stuck, thereby ensuring the safe use of the charging module.

[0079] Please refer to Figure 6 , Figure 6 This is a structural block diagram of a charging control device provided by an embodiment of the present invention. The device may include:

[0080] An acquisition unit 100 is used to acquire a target charging voltage;

[0081] The determination unit 200 is used to determine a target operating mode of the charging module according to a target charging voltage; wherein the target operating mode is a series mode or a parallel mode;

[0082] The control unit 300 is used to control the first double-contact relay and the second double-contact relay in the charging module according to the target working mode, so that the charging module charges the load in the target working mode.

[0083] Optionally, the determining unit 200 may include:

[0084] The voltage judgment subunit is used to judge whether the target charging voltage is greater than the switching voltage threshold; if so, the target working mode is determined to be the series mode; if not, the target working mode is determined to be the parallel mode.

[0085] Optionally, when the charging module includes a third double-contact relay and a first switch tube, the control unit 300 may include:

[0086] An operation determination subunit is used to determine whether the charging module is in an operation state;

[0087] A standby control subunit, for controlling the connection between the moving contacts of the first double-contact relay, the second double-contact relay and the third double-contact relay and the second static contact when the target working mode is the series mode; and controlling the connection between the moving contacts of the first double-contact relay, the second double-contact relay and the third double-contact relay and the first static contact when the target working mode is the parallel mode;

[0088] The operation control subunit is used to control the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube according to the current working state and target working mode of the charging module if it is in the running state.

[0089] Optionally, the operation control subunit may be specifically used to determine whether the current working mode of the charging module is the same as the target working mode; if it is the same as the target working mode, the conduction state of the first double-contact relay, the second double-contact relay and the third double-contact relay is maintained;

[0090] If it is different from the target working mode, when the target working mode is the series mode, the switch tube drive of the voltage conversion circuit in the charging module is turned off, and the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch on and connect to the second static contact; the first switch tube is driven and controlled to switch on at a fixed switching frequency and the duty cycle increases from 0 to 1 in a preset step; the moving contact of the third double-contact relay is controlled to switch on and connect to the second static contact, and the drive of the first switch tube is turned off after a preset time;

[0091] If it is different from the target operating mode, then when the target operating mode is the parallel mode, the moving contact of the third double-contact relay is controlled to switch and connect to the first static contact, and when the difference between the voltage of any conversion output of the voltage conversion circuit and the voltage of the first capacitor of the charging module is greater than the preset control voltage, the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch and connect to the first static contact.

[0092] In this embodiment, the embodiment of the present invention controls the first double-contact relay and the second double-contact relay in the charging module according to the target operating mode through the control unit 30, so that the charging module charges the load under the target operating mode, realizes the control of the series and parallel forms of the voltage conversion circuit output, and broadens the output voltage range of the charging module; and the first double-contact relay and the second double-contact relay can realize interlocking logic, avoiding the risk of short circuit of the bus when the relays are stuck, thereby ensuring the safe use of the charging module.

[0093] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0094] The above is a detailed introduction to a charging module, a charging control method and a device provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A charging module, characterized in that: include: A voltage conversion circuit, n-1 first double-contact relays, n-1 second double-contact relays, at least one third double-contact relay or at least one first switch tube; wherein n is a positive integer greater than or equal to 2; The voltage conversion circuit includes n conversion outputs, the positive output end of the i-th conversion output is connected to the positive output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th first double-contact relay, and the negative output end of the i-th conversion output is connected to the negative output end of the i+1-th conversion output through the moving contact and the first static contact of the i-th second double-contact relay; The second static contact of at least one first double-contact relay is connected to the second static contact of the corresponding second double-contact relay through the moving contact and the second static contact of the third double-contact relay, or the second static contact of at least one first double-contact relay is connected to the second static contact of the corresponding second double-contact relay through the first switch tube; The second static contact of the i-th first double-contact relay is connected to the second static contact of the i-th second double-contact relay; i is a positive integer less than or equal to n-1.

2. The charging module according to claim 1, characterized in that: When the voltage conversion circuit is specifically a DC / DC conversion circuit or an AC / DC conversion circuit, the charging module further includes: a first capacitor and an inductor; Among them, the positive output end of the 1st conversion output and the common end connected to the 1st first double-contact relay are connected to the positive output end of the nth conversion output and the common end connected to the nth first double-contact relay in sequence through the inductor and the first capacitor; the common end connected to the inductor and the first capacitor and the common end connected to the negative output end of the nth conversion output and the first capacitor serve as the positive output end and the negative output end of the charging module respectively, for charging the connected load.

3. The charging module according to claim 1, characterized in that: Also includes: n-1 first diodes and n-1 second diodes; Among them, the positive output end of the i-th conversion output is respectively connected to the first static contact of the i-th first double-contact relay and the cathode of the i-th first diode, and the positive output end of the i+1-th conversion output is respectively connected to the moving contact of the i-th first double-contact relay and the anode of the i-th first diode; the negative output end of the i-th conversion output is respectively connected to the moving contact of the i-th second double-contact relay and the cathode of the i-th second diode, and the negative output end of the i+1-th conversion output is respectively connected to the first static contact of the i-th second double-contact relay and the anode of the i-th second diode.

4. The charging module according to claim 1, characterized in that: Also includes: n second capacitors; Among them, the first end of the jth second capacitor is connected to the positive output end of the jth conversion output, and the first end of the jth second capacitor is connected to the negative output end of the jth conversion output; j is a positive integer less than or equal to n.

5. The charging module according to claim 1, characterized in that: When the voltage conversion circuit is specifically a DC / DC conversion circuit, the voltage conversion circuit includes: m first switch circuits, m second switch circuits, m first transformers, m second transformers, n first rectifier circuits, and n second rectifier circuits; wherein each of the first transformers and the second transformers includes n secondary windings, m is a positive integer greater than or equal to 2, and each of the first switch circuits and the second switch circuits includes at least one bridge arm, and the bridge arm includes two second switch tubes connected in series; The first input end of each of the first switch circuits is connected to the positive pole of the DC bus, the second input end of each of the first switch circuits and the first input end of each of the second switch circuits are grounded, and the second input end of each of the second switch circuits is connected to the negative pole of the DC bus; the first output end of each of the first switch circuits is connected one-to-one with the first end of the primary winding of the corresponding first transformer, the second output end of each of the first switch circuits is connected one-to-one with the second end of the primary winding of the corresponding first transformer, the first output end of each of the second switch circuits is connected one-to-one with the first end of the primary winding of the corresponding second transformer, and the second output end of each of the second switch circuits is connected one-to-one with the second end of the primary winding of the corresponding second transformer; The second end of the jth secondary winding of the kth first transformer is connected to the first end of the jth secondary winding of the k+1th first transformer, the first end of the jth secondary winding of the 1st first transformer is connected to the first input end of the jth first rectifier circuit, and the second end of the jth secondary winding of the mth first transformer is connected to the second input end of the jth first rectifier circuit; the second end of the jth secondary winding of the kth second transformer is connected to the first end of the jth secondary winding of the k+1th second transformer, the first end of the jth secondary winding of the 1st second transformer is connected to the first input end of the jth second rectifier circuit, and the second end of the jth secondary winding of the mth second transformer is connected to the second input end of the jth second rectifier circuit; k is a positive integer less than or equal to m-1, and j is a positive integer less than or equal to n; The common end connected to the positive output end of the jth first rectifier circuit and the positive output end of the jth second rectifier circuit serves as the positive output end of the jth conversion output, and the common end connected to the negative output end of the jth first rectifier circuit and the negative output end of the jth second rectifier circuit serves as the negative output end of the jth conversion output.

6. A charging control method, characterized in that: A charging module according to any one of claims 1 to 5, comprising: Get the target charging voltage; Determining a target operating mode of the charging module according to the target charging voltage; wherein the target operating mode is a series mode or a parallel mode; According to the target working mode, the first double-contact relay and the second double-contact relay in the charging module are controlled so that the charging module charges the load under the target working mode.

7. The charging control method according to claim 6, characterized in that: The step of determining the working mode of the charging module according to the target charging voltage includes: Determining whether the target charging voltage is greater than a switching voltage threshold; If yes, determining that the target operating mode is the series mode; If not, the target operating mode is determined to be the parallel mode.

8. The charging control method according to claim 6, characterized in that: When the charging module includes a third double-contact relay and a first switch tube, controlling the first double-contact relay and the second double-contact relay in the charging module according to the target working mode includes: Determining whether the charging module is in operation; If not, when the target operating mode is the series mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the second static contact is controlled to be turned on; when the target operating mode is the parallel mode, the connection between the moving contact of the first double-contact relay, the second double-contact relay and the third double-contact relay and the first static contact is controlled to be turned on; If so, the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube are controlled according to the current working state of the charging module and the target working mode.

9. The charging control method according to claim 8, characterized in that: The current working mode and the target working mode of the charging module control the first double-contact relay, the second double-contact relay, the third double-contact relay and the first switch tube, including: Determining whether the current operating mode of the charging module is the same as the target operating mode; If the operating mode is the same as the target operating mode, maintaining the conducting state of the first double-contact relay, the second double-contact relay and the third double-contact relay; If it is different from the target working mode, when the target working mode is the series mode, the switch tube drive of the voltage conversion circuit in the charging module is turned off, and the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch on and connect to the second static contact; the first switch tube is driven and controlled to switch on at a fixed switching frequency and a duty cycle increasing from 0 to 1 in a preset step; the moving contact of the third double-contact relay is controlled to switch on and connect to the second static contact, and the drive of the first switch tube is turned off after a preset time; If it is different from the target operating mode, then when the target operating mode is the parallel mode, the moving contact of the third double-contact relay is controlled to switch and connect to the first static contact, and when the difference between the voltage of any conversion output of the DC / DC conversion circuit and the voltage of the first capacitor of the charging module is greater than the preset control voltage, the moving contacts of the first double-contact relay and the second double-contact relay are controlled to switch and connect to the first static contact.

10. A charging control device, characterized in that: A charging module according to any one of claims 1 to 5, comprising: An acquisition unit, used for acquiring a target charging voltage; A determination unit, configured to determine a target operating mode of the charging module according to the target charging voltage; wherein the target operating mode is a series mode or a parallel mode; The control unit is used to control the first double-contact relay and the second double-contact relay in the charging module according to the target working mode, so that the charging module charges the load in the target working mode.

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