Power supply circuit of control mainboard and energy storage converter

Abstract

The invention relates to a power supply circuit of a control mainboard and an energy storage converter, the circuit comprises a first switch unit, a second switch unit and a comparison unit, the first switch unit is connected between a PCS AC side and the control mainboard; the second switch unit is connected between the PCS direct current side and the control mainboard; the comparison unit is respectively connected with the first switch unit, the second switch unit, the PCS alternating current side and the PCS direct current side; the comparison unit is used for comparing the first output voltage with the second output voltage, outputting a first control voltage or a second control voltage to the first switch unit and the second switch unit according to a comparison result, and controlling the first switch unit and the second switch unit through the first control voltage or the second control voltage. And the PCS alternating current side or the PCS direct current side supplies power to the control mainboard. Through the technical scheme provided by the invention, the technical problem that the control mainboard cannot be started when the undervoltage problem occurs on one side for supplying power to the control mainboard is solved.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a power supply circuit for a control motherboard and an energy storage converter. Background Art

[0002] Some PCS (Power Control System) products feature a control motherboard to monitor the PCS's operating status and operational faults. Typically, technicians power the control motherboard from either the PCS's DC or AC side.

[0003] However, in some actual scenarios, undervoltage may occur on the PCS DC side or the PCS AC side. When an undervoltage occurs on the side that the technician sets to power the control motherboard, the control motherboard cannot start normally, affecting the function of the control motherboard and causing inconvenience. Summary of the Invention

[0004] The present application provides a power supply circuit and energy storage converter for a control mainboard to solve the technical problem that the control mainboard cannot start normally when an undervoltage problem occurs on the side supplying power to the control mainboard.

[0005] In a first aspect, the present application provides a power supply circuit for controlling a mainboard, the power supply circuit for controlling the mainboard comprising a first switch unit, a second switch unit, and a comparison unit, wherein:

[0006] A first end of the first switch unit is connected to the PCS AC side, a second end of the first switch unit is connected to the control mainboard, and a control end of the first switch unit is connected to the output end of the comparison unit; a first end of the second switch unit is connected to the PCS DC side, a second end of the second switch unit is connected to the control mainboard, and a control end of the second switch unit is connected to the output end of the comparison unit; a first input end of the comparison unit is connected to the PCS AC side, and a second input end of the comparison unit is connected to the PCS DC side;

[0007] The comparison unit is used to compare the first output voltage with the second output voltage, and output a first control voltage or a second control voltage to the first switch unit and the second switch unit according to the comparison result; wherein, the first output voltage is the voltage outputted by the AC side of the PCS, and the second output voltage is the voltage outputted by the DC side of the PCS; when the first output voltage is greater than or equal to the second output voltage, the comparison unit outputs the first control voltage to the first switch unit and the second switch unit, and the first control voltage is used to control the first switch unit to be turned on and the second switch unit to be turned off, so that the first output voltage is outputted to the control mainboard, and the control mainboard is powered by the first output voltage; when the first output voltage is less than the second output voltage, the comparison unit outputs the first control voltage to the first switch unit and the second switch unit, and the second control voltage is used to control the first switch unit to be turned off and the second switch unit to be turned on, so that the second output voltage is outputted to the control mainboard, and the control mainboard is powered by the second output voltage.

[0008] In a feasible embodiment of the present application, the power supply circuit of the control mainboard further includes an energy storage unit;

[0009] The energy storage unit is connected to the second switch unit and the PCS DC side respectively;

[0010] The energy storage unit is configured to be charged by the second output voltage when the first output voltage is greater than or equal to the second output voltage;

[0011] The energy storage unit is further configured to supply power to the control mainboard when the first output voltage is lower than the second output voltage.

[0012] In a feasible embodiment of the present application, the first switch unit includes a first N-type MOS transistor and a second N-type MOS transistor;

[0013] The drain of the first N-type MOS transistor serves as the first end of the first switch unit and is connected to the PCS AC side. The source of the first N-type MOS transistor serves as the second end of the first switch unit and is connected to the control mainboard. The gate of the first N-type MOS transistor is respectively connected to the drain of the first N-type MOS transistor and the drain of the second N-type MOS transistor. The gate of the second N-type MOS transistor serves as the control end of the first switch unit and is connected to the output end of the comparison unit. The source of the second N-type MOS transistor is grounded.

[0014] In a feasible embodiment of the present application, the first switch unit further includes a first resistor;

[0015] The first resistor is connected between the drain of the first N-type MOS transistor and the gate of the first N-type MOS transistor.

[0016] In a feasible embodiment of the present application, the second switch unit includes a P-type MOS tube;

[0017] The drain of the P-type MOS transistor serves as the first end of the second switch unit and is connected to the PCS DC side. The source of the P-type MOS transistor serves as the second end of the second switch unit and is connected to the control main board. The source of the P-type MOS transistor also serves as the control end of the second switch unit and is connected to the output end of the comparison unit. The gate of the P-type MOS transistor is grounded.

[0018] In a feasible embodiment of the present application, the second switch unit further includes a manual switch;

[0019] One end of the manual switch is connected to the drain of the P-type MOS tube, and the other end of the manual switch serves as the first end of the second switch unit and is connected to the PCS DC side.

[0020] In a feasible embodiment of the present application, the comparison unit includes a comparator and a second resistor;

[0021] The inverting input terminal of the comparator is connected to the PCS AC side as the first input terminal of the comparison unit, the non-inverting input terminal of the comparator is connected to the PCS DC side as the first input terminal of the comparison unit, and the output terminal of the comparator is connected to the first switch unit and the second switch unit as the output terminal of the comparison unit;

[0022] The second resistor is connected between the non-inverting input terminal of the comparator and the PCS DC side.

[0023] In a feasible embodiment of the present application, the comparison unit further includes a diode;

[0024] The anode of the diode is connected to the output end of the comparator, and the cathode of the diode, as the output end of the comparison unit, is connected to the first switch unit and the second switch unit respectively.

[0025] In a feasible embodiment of the present application, when the voltage on the inverting input terminal of the comparator is greater than the voltage on the non-inverting input terminal of the comparator, the output terminal of the comparator outputs the first control voltage, and the first control voltage is a low-level voltage;

[0026] When the voltage at the inverting input terminal of the comparator is less than the voltage at the non-inverting input terminal of the comparator, the output terminal of the comparator outputs the second control voltage, which is a high-level voltage.

[0027] In a second aspect, the present application provides an energy storage converter, which includes a power supply circuit of a control mainboard as described in any one of the embodiments of the first aspect above.

[0028] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0029] In the technical solution provided by the embodiment of the present application, a comparison unit controls the first switch unit and the second switch unit using a first control voltage or a second control voltage. When the first output voltage is greater than or equal to the second output voltage, the comparison unit outputs the first control voltage to the first switch unit and the second switch unit. The first control voltage is used to control the first switch unit to be turned on and the second switch unit to be turned off, so that the first output voltage is output to the control mainboard, and the first output voltage is used to supply power to the control mainboard. When the first output voltage is less than the second output voltage, the comparison unit outputs the first control voltage to the first switch unit and the second switch unit. The second control voltage is used to control the first switch unit to be turned off and the second switch unit to be turned on, so that the second output voltage is output to the control mainboard, and the second output voltage is used to supply power to the control mainboard.

[0030] Through the technical solution provided in this application, the control main board can be powered by either the PCS AC side or the PCS DC side, and the comparison unit will select the better side to power the control main board. When an undervoltage problem occurs on either the PCS AC side or the PCS DC side, it can switch to the other side to power the control main board, which can solve the technical problem that the control main board cannot start normally when an undervoltage problem occurs on the side powering the control main board. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0034] Figure 1A circuit diagram of a power supply circuit for a control motherboard provided in an embodiment of the present application;

[0035] Figure 2 Another circuit diagram of a power supply circuit for controlling a mainboard provided in an embodiment of the present application;

[0036] Figure 3 A circuit connection diagram of a power supply circuit for a control motherboard provided in an embodiment of the present application;

[0037] Figure 4 A schematic structural diagram of an energy storage converter provided in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 1. First switch unit; 2. Second switch unit; 3. Comparison unit; 4. Energy storage unit;

[0040] R1, first resistor; R2, second resistor; N1, first N-type MOS transistor; N2, second N-type MOS transistor; P, P-type MOS transistor; K, manual switch; U, comparator; D, diode. DETAILED DESCRIPTION

[0041] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0043] In order to solve the technical problem in the prior art that the control motherboard cannot start normally when an undervoltage problem occurs on the side supplying power to the control motherboard, the present application provides a power supply circuit and energy storage converter for the control motherboard, which can switch to the other side to power the control motherboard when an undervoltage problem occurs on either side of the PCS AC side or the PCS DC side.

[0044] Figure 1A circuit diagram of a power supply circuit for a control motherboard provided in an embodiment of the present application, referring to Figure 1 The power supply circuit of a control mainboard provided in an embodiment of the present application specifically includes a first switch unit 1, a second switch unit 2, and a comparison unit 3. In the power supply circuit of a control mainboard provided in an embodiment of the present application, the connection relationship between the first switch unit 1, the second switch unit 2, and the comparison unit 3 is as follows:

[0045] A first end of the first switch unit 1 is connected to the PCS AC side, a second end of the first switch unit 1 is connected to the control mainboard, and a control end of the first switch unit 1 is connected to the output end of the comparison unit 3; a first end of the second switch unit 2 is connected to the PCS DC side, a second end of the second switch unit 2 is connected to the control mainboard, and a control end of the second switch unit 2 is connected to the output end of the comparison unit 3; a first input end of the comparison unit 3 is connected to the PCS AC side, and a second input end of the comparison unit 3 is connected to the PCS DC side.

[0046] The comparison unit 3 is used to compare the first output voltage with the second output voltage, and output the first control voltage or the second control voltage to the first switch unit 1 and the second switch unit 2 according to the comparison result; wherein the first output voltage is the voltage outputted by the AC side of the PCS, and the second output voltage is the voltage outputted by the DC side of the PCS; when the first output voltage is greater than or equal to the second output voltage, the comparison unit 3 outputs the first control voltage to the first switch unit 1 and the second switch unit 2, and the first control voltage is used to control the first switch unit 1 to be turned on and the second switch unit 2 to be turned off, so that the first output voltage is outputted to the control main board, and the control main board is powered by the first output voltage; when the first output voltage is less than the second output voltage, the comparison unit 3 outputs the first control voltage to the first switch unit 1 and the second switch unit 2, and the second control voltage is used to control the first switch unit 1 to be turned off and the second switch unit 2 to be turned on, so that the second output voltage is outputted to the control main board, and the control main board is powered by the second output voltage.

[0047] Specifically, the first switch unit 1 is connected between the control mainboard and the PCS AC side and is also connected to the comparison unit 3. The first switch unit 1 is controlled by the comparison unit 3 and can switch between on and off based on the control of the comparison unit 3. When the first switch unit 1 is on, the circuit between the control mainboard and the PCS AC side is connected, and the PCS AC side provides power to the control mainboard. When the first switch unit 1 is off, the circuit between the control mainboard and the PCS AC side is disconnected.

[0048] The second switch unit 2 is connected between the control mainboard and the PCS DC side and is also connected to the comparison unit 3. The second switch unit 2 is also controlled by the comparison unit 3, and its switching state can be switched between on and off based on the control of the comparison unit 3. When the second switch unit 2 is in the on state, the circuit between the control mainboard and the PCS DC side is connected, and the PCS DC side provides power to the control mainboard. When the second switch unit 2 is in the off state, the circuit between the control mainboard and the PCS DC side is disconnected.

[0049] The comparison unit 3 is connected to the first switch unit 1, the second switch unit 2, the PCS AC side, and the PCS DC side, respectively. The comparison unit 3 can compare the first output voltage output by the PCS AC side with the second output voltage output by the PCS DC side, and control the switching state of the first switch unit 1 and the second switch unit 2 based on the comparison result of the first output voltage and the second output voltage.

[0050] When the first output voltage is greater than or equal to the second output voltage, the comparison unit 3 generates a first control voltage and outputs the first control voltage to the first switch unit 1 and the second switch unit 2. The first control voltage is used to control the first switch unit 1 to be conductive and the second switch unit 2 to be disconnected. As a result, the circuit between the control mainboard and the PCS AC side is connected, and the circuit between the control mainboard and the PCS DC side is disconnected, and the control mainboard is powered by the PCS AC side.

[0051] When the first output voltage is lower than the second output voltage, the comparison unit 3 generates a second control voltage and outputs the second control voltage to the first switch unit 1 and the second switch unit 2. The second control voltage is used to control the first switch unit 1 to be disconnected and the second switch unit 2 to be connected. As a result, the circuit between the control mainboard and the PCS DC side is connected, while the circuit between the control mainboard and the PCS AC side is disconnected, and the control mainboard is powered by the PCS DC side.

[0052] Through the technical solution provided in the present application, the control main board can be powered by either the PCS AC side or the PCS DC side, and the comparison unit 3 will select the better side (the side with the larger current output voltage) to power the control main board. When an undervoltage problem occurs on either the PCS AC side or the PCS DC side, it can switch to the other side to power the control main board, which can solve the technical problem that the control main board cannot start normally when an undervoltage problem occurs on the side powering the control main board.

[0053] In some possible practical scenarios, undervoltage problems occur on both the PCS AC side and the PCS DC side. In order to still provide power to the control mainboard under such circumstances, an energy storage unit 4 can be set in the power supply circuit of the control mainboard provided in the embodiment of the present application. Figure 2 Another circuit diagram of a power supply circuit for controlling a motherboard provided in an embodiment of the present application, referring to Figure 2 In a feasible embodiment of the present application, the power supply circuit of the control mainboard further includes an energy storage unit 4;

[0054] The energy storage unit 4 is connected to the second switch unit 2 and the PCS DC side respectively;

[0055] The energy storage unit 4 is configured to be charged by the second output voltage when the first output voltage is greater than or equal to the second output voltage;

[0056] The energy storage unit 4 is further configured to supply power to the control mainboard when the first output voltage is lower than the second output voltage.

[0057] Specifically, the energy storage unit 4 is connected to the second switch unit 2 and the PCS DC side respectively. Under normal circumstances (there is no undervoltage problem on both the PCS AC side and the PCS DC side), the energy storage unit 4 receives the second output voltage output by the PCS DC side for charging and energy storage; when the first output voltage is lower than the second output voltage, when the PCS DC side supplies power to the control mainboard, the electric energy passes through the energy storage unit 4 to supply power to the control mainboard; when the first output voltage is lower than the second output voltage and the second output voltage is too low to meet the power supply requirements of the control mainboard, the energy storage unit 4 stores electric energy, and the control mainboard can be powered by the energy storage unit 4.

[0058] It is understandable that, as can be seen from the above embodiment, when the first output voltage is greater than or equal to the second output voltage, the circuit between the control mainboard and the PCS AC side is connected, and the circuit between the control mainboard and the PCS DC side is disconnected. Based on this configuration, when neither the first output voltage nor the second output voltage is undervoltage, the control mainboard is still powered by the first output voltage. The purpose of this configuration is to enable the energy storage unit 4 to be charged by the second output voltage under normal circumstances, so that when both the PCS AC side and the PCS DC side experience undervoltage, the energy storage unit 4 has a sufficient amount of power, ensuring that the control mainboard can still operate normally even when both the PCS AC side and the PCS DC side experience undervoltage.

[0059] In a feasible embodiment of the present application, when setting up an energy storage converter that can apply the above-mentioned embodiment of the present application to provide a power supply circuit for the control motherboard, technicians can pre-charge the energy storage unit 4 to ensure the normal operation of the control motherboard.

[0060] The energy storage unit 4 determines whether it needs to be charged or discharged based on the voltage value of the first output voltage. In a feasible embodiment of the present application, when the voltage value of the first output voltage is less than the set voltage threshold, the energy storage unit 4 discharges; when the voltage value of the first output voltage is greater than or equal to the set voltage threshold, the energy storage unit 4 charges.

[0061] In a feasible embodiment of the present application, the energy storage unit 4 may be a battery with a battery management system, and the specific type of the battery is not limited in the present application.

[0062] Continue to refer to Figure 3 To meet the power supply requirements of the control board and simultaneously enable the energy storage converter, the first output voltage from the PCS's AC side is converted by an AC switching power supply before being input into the control board's power supply circuit. The second output voltage from the PCS's DC side is converted by a DC switching power supply before being input into the control board's power supply circuit. In some practical applications, the AC switching power supply is rated for a first output voltage of 24V, and the DC switching power supply is rated for a second output voltage of 24V.

[0063] Figure 3 A circuit connection diagram of a power supply circuit for a control motherboard provided in an embodiment of the present application, referring to Figure 3 The specific circuit connection method and working principle of a power supply circuit for controlling a mainboard provided in an embodiment of the present application are described.

[0064] In a feasible embodiment of the present application, the first switch unit 1 includes a first N-type MOS transistor N1 and a second N-type MOS transistor N2;

[0065] The drain of the first N-type MOS transistor N1 serves as the first end of the first switch unit 1 and is connected to the PCS AC side. The source of the first N-type MOS transistor N1 serves as the second end of the first switch unit 1 and is connected to the control mainboard. The gate of the first N-type MOS transistor N1 is respectively connected to the drain of the first N-type MOS transistor N1 and the drain of the second N-type MOS transistor N2. The gate of the second N-type MOS transistor N2 serves as the control end of the first switch unit 1 and is connected to the output end of the comparison unit 3. The source of the second N-type MOS transistor N2 is grounded.

[0066] In a feasible embodiment of the present application, the second switch unit 2 includes a P-type MOS transistor P;

[0067] The drain of the P-type MOS transistor P serves as the first end of the second switch unit 2 and is connected to the PCS DC side. The source of the P-type MOS transistor P serves as the second end of the second switch unit 2 and is connected to the control main board. The source of the P-type MOS transistor P also serves as the control end of the second switch unit 2 and is connected to the output end of the comparison unit 3. The gate of the P-type MOS transistor P is grounded.

[0068] In a feasible embodiment of the present application, the comparison unit 3 includes a comparator U and a second resistor R2;

[0069] The inverting input terminal of the comparator U is connected to the AC side of the PCS as the first input terminal of the comparison unit 3, the non-inverting input terminal of the comparator U is connected to the DC side of the PCS as the first input terminal of the comparison unit 3, and the output terminal of the comparator U is connected to the first switch unit 1 and the second switch unit 2 as the output terminal of the comparison unit 3;

[0070] The second resistor R2 is connected between the non-inverting input terminal of the comparator U and the DC side of the PCS.

[0071] In a feasible embodiment of the present application, when the voltage on the inverting input terminal of the comparator U is greater than the voltage on the non-inverting input terminal of the comparator U, the output terminal of the comparator U outputs a first control voltage, and the first control voltage is a low-level voltage;

[0072] When the voltage at the inverting input terminal of the comparator U is less than the voltage at the non-inverting input terminal of the comparator U, the output terminal of the comparator U outputs a second control voltage, which is a high-level voltage.

[0073] Based on the above embodiment, considering the possible numerical relationships between the first output voltage of the PCS AC side output and the second output voltage of the PCS DC side output, the power supply circuit of the control mainboard provided in the embodiment of the present application may have the following situations during operation:

[0074] Case 1: The first output voltage of the PCS AC side output and the second output voltage of the PCS DC side output are both normal, and the first output voltage is equal to the second output voltage (for example, the rated output voltage of the AC switching power supply is 24V, and the rated output voltage of the DC switching power supply is 24V).

[0075] In case 1, the first output voltage is output to the inverting input terminal of the comparator U, and the second output voltage is output to the non-inverting input terminal of the comparator U. Due to the voltage dividing effect of the second resistor R2, the voltage on the inverting input terminal of the comparator U is greater than the voltage on the non-inverting input terminal of the comparator U. The comparator U outputs the first control voltage at the output terminal, which appears as a low-level voltage.

[0076] In the second switch unit 2, the first control voltage is input to the source of the P-type MOS transistor P. Since the gate of the P-type MOS transistor P is grounded and the first control voltage is a low-level voltage, for the P-type MOS transistor P, Vgs<Vth, and the P-type MOS transistor P is not conducting. Therefore, the second switch unit 2 is not conducting, and the second output voltage outputted by the PCS DC side does not power the control mainboard, but charges the energy storage unit 4.

[0077] In the first switch unit 1, the first control voltage is input to the gate of the second N-type MOS transistor N2. Since the source of the second N-type MOS transistor N2 is grounded and the first control voltage is a low-level voltage, the second N-type MOS transistor N2 holds: Vgs<Vth, and the second N-type MOS transistor N2 is not conducting. Furthermore, since the gate of the first N-type MOS transistor N1 is connected to the drain of the first N-type MOS transistor N1, a high-level voltage is input to the gate of the first N-type MOS transistor N1. Since the second switch unit 2 is not conducting, the source of the first N-type MOS transistor N1 holds: Vgs>Vth>0, and the first N-type MOS transistor N1 is conducting. Therefore, the first switch unit 1 is conducting, and the first output voltage outputted from the AC side of the PCS supplies power to the control mainboard.

[0078] Case 2: The first output voltage of the PCS AC side output is normal, and the second output voltage of the PCS DC side output is undervoltage (for example, the rated output voltage of the AC switching power supply is 24V, and the rated output voltage of the DC switching power supply is 5V).

[0079] The control principle is the same as that in case 1 above.

[0080] Case 3: The first output voltage of the PCS AC side output is undervoltage, and the second output voltage of the PCS DC side output is normal (for example, the AC switching power supply is rated to output a first output voltage of 5V, and the DC switching power supply is rated to output a second output voltage of 24V).

[0081] In case three, the first output voltage is output to the inverting input terminal of the comparator U, and the second output voltage is output to the non-inverting input terminal of the comparator U. Despite the voltage dividing effect of the second resistor R2, the voltage at the inverting input terminal of the comparator U is still significantly lower than the voltage at the non-inverting input terminal of the comparator U. The comparator U outputs the second control voltage at the output terminal, which appears as a high-level voltage.

[0082] In the second switch unit 2, the second control voltage is input to the source of the P-type MOS transistor P. Since the gate of the P-type MOS transistor P is grounded and the first control voltage is a high-level voltage, for the P-type MOS transistor P, Vgs<Vth<0 is satisfied. The P-type MOS transistor P is turned on, and therefore the second switch unit 2 is turned on. The second output voltage outputted from the DC side of the PCS charges the control mainboard through the energy storage unit 4.

[0083] In the first switch unit 1, the second control voltage is input to the gate of the second N-type MOS transistor N2. Since the first control voltage is a high-level voltage, the second N-type MOS transistor N2 satisfies: Vgs>Vth>0, and the second N-type MOS transistor N2 is turned on. Furthermore, since the gate of the first N-type MOS transistor N1 is connected to the drain of the first N-type MOS transistor N1, the gate of the first N-type MOS transistor N1 is grounded via the turned-on second N-type MOS transistor N2. Simultaneously, since the second switch unit 2 is not turned on, the source of the first N-type MOS transistor N1 is a high-level voltage. For the first N-type MOS transistor N1, the first N-type MOS transistor N1 satisfies: Vgs<0, and the first N-type MOS transistor N1 is not turned on. Therefore, the first switch unit 1 is not turned on, and the first output voltage outputted from the AC side of the PCS does not power the control mainboard.

[0084] Case 4: The first output voltage of the PCS AC side output is undervoltage, and the second output voltage of the PCS DC side output is also undervoltage (for example, the AC switching power supply has a rated output of 5V for the first output voltage, and the DC switching power supply has a rated output of 5V for the second output voltage).

[0085] The energy storage unit 4 starts to work, and other control principles are the same as those in the fourth case. The energy storage unit 4 supplies power to the control mainboard through the second switch unit 2.

[0086] Continue to refer to Figure 3 In a feasible embodiment of the present application, the first switch unit 1 further includes a first resistor R1; the first resistor R1 is connected between the drain and gate of the first N-type MOS transistor N1. By providing the first resistor R1, overcurrent protection is achieved.

[0087] Continue to refer to Figure 3 In one feasible embodiment of the present application, the second switch unit 2 further includes a manual switch K. One end of the manual switch K is connected to the drain of the P-type MOS transistor P, and the other end of the manual switch K serves as the first end of the second switch unit 2 and is connected to the DC side of the PCS. By providing the manual switch K, technicians can manually power off the control board.

[0088] Continue to refer to Figure 3 In a feasible embodiment of the present application, the comparison unit 3 further includes a diode D; the anode of the diode D is connected to the output terminal of the comparator U, and the cathode of the diode D, serving as the output terminal of the comparison unit 3, is connected to the first switch unit 1 and the second switch unit 2, respectively. By providing the diode D, the circuit is protected against reverse current.

[0089] Figure 4 A schematic diagram of the structure of an energy storage converter provided in an embodiment of the present application, referring to Figure 4An embodiment of the present application also provides an energy storage converter, which includes a power supply circuit of the control mainboard and a control mainboard as described in any one of the above embodiments of the present application.

[0090] In a feasible embodiment of the present application, the energy storage inverter may further include a display device, which may be a cathode ray tube display, a digital tube display, a light-emitting diode (LED) display, or the like capable of displaying images. The display device is connected to the control mainboard and is used to display the current working status of the energy storage inverter to the user.

[0091] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0092] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily 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 is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A power supply circuit for controlling a mainboard, characterized in that: The power supply circuit of the control mainboard comprises a first switch unit (1), a second switch unit (2) and a comparison unit (3), wherein: The first end of the first switch unit (1) is connected to the PCS AC side, the second end of the first switch unit (1) is connected to the control mainboard, and the control end of the first switch unit (1) is connected to the output end of the comparison unit (3); the first end of the second switch unit (2) is connected to the PCS DC side, the second end of the second switch unit (2) is connected to the control mainboard, and the control end of the second switch unit (2) is connected to the output end of the comparison unit (3); the first input end of the comparison unit (3) is connected to the PCS AC side, and the second input end of the comparison unit (3) is connected to the PCS DC side; The comparison unit (3) is used to compare the first output voltage with the second output voltage, and output the first control voltage or the second control voltage to the first switch unit (1) and the second switch unit (2) according to the comparison result; wherein the first output voltage is the voltage outputted by the PCS AC side, and the second output voltage is the voltage outputted by the PCS DC side; when the first output voltage is greater than or equal to the second output voltage, the comparison unit (3) outputs the first control voltage to the first switch unit (1) and the second switch unit (2), and the first control voltage is used to control the first switch unit (1) to be turned on and the second switch unit (2) to be turned off, so that the first output voltage is outputted to the control mainboard, and the control mainboard is powered by the first output voltage; when the first output voltage is less than the second output voltage, the comparison unit (3) outputs the first control voltage to the first switch unit (1) and the second switch unit (2), and the second control voltage is used to control the first switch unit (1) to be turned off and the second switch unit (2) to be turned on, so that the second output voltage is outputted to the control mainboard, and the control mainboard is powered by the second output voltage.

2. The power supply circuit of the control mainboard according to claim 1, characterized in that: The power supply circuit of the control mainboard also includes an energy storage unit (4); The energy storage unit (4) is connected to the second switch unit (2) and the PCS DC side respectively; The energy storage unit (4) is used for charging by means of the second output voltage when the first output voltage is greater than or equal to the second output voltage; The energy storage unit (4) is also used to supply power to the control mainboard when the first output voltage is lower than the second output voltage.

3. The power supply circuit of the control mainboard according to claim 1, characterized in that: The first switch unit (1) comprises a first N-type MOS transistor (N1) and a second N-type MOS transistor (N2); The drain of the first N-type MOS transistor (N1) is connected to the PCS AC side as the first end of the first switch unit (1); the source of the first N-type MOS transistor (N1) is connected to the control main board as the second end of the first switch unit (1); the gate of the first N-type MOS transistor (N1) is respectively connected to the drain of the first N-type MOS transistor (N1) and the drain of the second N-type MOS transistor (N2); the gate of the second N-type MOS transistor (N2) is connected to the output end of the comparison unit (3) as the control end of the first switch unit (1); and the source of the second N-type MOS transistor (N2) is grounded.

4. The power supply circuit of the control mainboard according to claim 3, characterized in that: The first switch unit (1) further comprises a first resistor (R1); The first resistor (R1) is connected between the drain of the first N-type MOS transistor (N1) and the gate of the first N-type MOS transistor (N1).

5. The power supply circuit of the control mainboard according to claim 1, characterized in that: The second switch unit (2) comprises a P-type MOS tube (P); The drain of the P-type MOS tube (P) is connected to the PCS DC side as the first end of the second switch unit (2), the source of the P-type MOS tube (P) is connected to the control main board as the second end of the second switch unit (2), the source of the P-type MOS tube (P) is also connected to the output end of the comparison unit (3) as the control end of the second switch unit (2), and the gate of the P-type MOS tube (P) is grounded.

6. The power supply circuit of the control mainboard according to claim 1, characterized in that: The second switch unit (2) further comprises a manual switch (K); One end of the manual switch (K) is connected to the drain of the P-type MOS tube (P), and the other end of the manual switch (K) is connected to the PCS DC side as the first end of the second switch unit (2).

7. The power supply circuit of the control mainboard according to claim 1, characterized in that: The comparison unit (3) comprises a comparator (U) and a second resistor (R2); The inverting input end of the comparator (U) is connected to the PCS AC side as the first input end of the comparison unit (3), the non-inverting input end of the comparator (U) is connected to the PCS DC side as the first input end of the comparison unit (3), and the output end of the comparator (U) is connected to the first switch unit (1) and the second switch unit (2) as the output end of the comparison unit (3); The second resistor (R2) is connected between the non-inverting input terminal of the comparator (U) and the PCS DC side.

8. The power supply circuit of the control mainboard according to claim 7, characterized in that: The comparison unit (3) further comprises a diode (D); The anode of the diode (D) is connected to the output end of the comparator (U), and the cathode of the diode (D) is connected to the first switch unit (1) and the second switch unit (2) as the output end of the comparison unit (3).

9. The power supply circuit of the control mainboard according to claim 7, characterized in that: When the voltage at the inverting input terminal of the comparator (U) is greater than the voltage at the non-inverting input terminal of the comparator (U), the output terminal of the comparator (U) outputs the first control voltage, which is a low-level voltage; When the voltage at the inverting input terminal of the comparator (U) is less than the voltage at the non-inverting input terminal of the comparator (U), the output terminal of the comparator (U) outputs the second control voltage, which is a high-level voltage.

10. An energy storage converter, characterized in that: The energy storage converter comprises a power supply circuit of a control mainboard as described in any one of claims 1-9.

Images