Switch module control circuit and energy storage power supply

Abstract

The invention relates to a switch module control circuit and an energy storage power supply. The switch module control circuit comprises a power supply circuit, a locking module, a detection module and a driving module. The power supply circuit is arranged between a power supply end and a load end, and a switch module and an overcurrent protection element are arranged on the power supply circuit; the overcurrent protection element is used for being disconnected when the current output by the power supply circuit is larger than a preset current threshold value. The locking module is used for outputting a locking signal when the driving signal of the switch module is a high level, and the high level is a corresponding signal for driving the switch module to be conducted; the detection module is used for bypassing the locking signal when the power supply circuit is switched on; and the driving module is used for controlling the switch module to be switched off when the locking signal is received, and controlling the switch module to be switched on based on the driving signal when the locking signal is not received. By adopting the switch module control circuit, the reliability of the switch module on the power supply circuit of the energy storage power supply can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply control, in particular to a switch module control circuit and an energy storage power supply. BACKGROUND

[0002] A switch module is usually arranged on a power supply circuit in an energy storage power supply for supplying power to a load. If the switch module is turned on and the power supply circuit is turned on, the energy storage power supply can supply power to the load. If the switch module is turned off and the power supply circuit is turned off, the energy storage power supply stops supplying power to the load.

[0003] If the current output by the power supply circuit of the energy storage power supply is too large, it will affect the reliable operation of the load, so the switch module arranged on the power supply circuit needs to be turned off. In the conventional technology, a controller is usually used to output an off signal to the switch module, so that the switch module is turned off according to the off signal.

[0004] However, in the conventional technology, the switch module arranged on the power supply circuit of the energy storage power supply has the problem of cutting off large current, which reduces the reliability of the switch module on the power supply circuit of the energy storage power supply. SUMMARY

[0005] Therefore, the present application provides a switch module control circuit and an energy storage power supply, which can improve the reliability of the switch module on the power supply circuit of the energy storage power supply.

[0006] In a first aspect, the present application provides a switch module control circuit, which comprises a power supply circuit, a locking module, a detection module and a driving module. The power supply circuit is arranged between a power supply end and a load end. A switch module and an overcurrent protection element are arranged on the power supply circuit. The overcurrent protection element is used to turn off when the current output by the power supply circuit is greater than a preset current threshold.

[0007] The locking module is used to output a locking signal when the driving signal of the switch module is at a high level, wherein the high level corresponds to a signal for driving the switch module to turn on.

[0008] The detection module is used to bypass the locking signal when the power supply circuit is turned on.

[0009] The driving module is used to control the switch module to turn off when the locking signal is received, and to control the switch module to turn on based on the driving signal when the locking signal is not received.

[0010] In some embodiments, the detection module comprises a signal detection unit and a bypass unit.

[0011] The signal detection unit is used to output a first voltage signal when the power supply circuit is turned on, and to output a second voltage signal when the power supply circuit is turned off.

[0012] The bypass unit is configured to bypass the lock signal when the first voltage signal is received, and output the lock signal when the second voltage signal is received.

[0013] In some embodiments, the signal detection unit comprises an optocoupler, a first diode and a first capacitor.

[0014] The anode of the optocoupler is connected to the live wire of the power supply circuit, the cathode of the optocoupler is connected to the zero line of the power supply circuit, the collector of the optocoupler is connected to the target voltage, the emitter of the optocoupler is connected to the bypass unit, and the emitter of the optocoupler is also connected to the first capacitor.

[0015] The anode of the first diode is connected to the cathode of the optocoupler, and the cathode of the first diode is connected to the anode of the optocoupler.

[0016] In some embodiments, the bypass unit comprises a first switch component and a second capacitor.

[0017] The control end of the first switch component is connected to the output end of the signal detection unit, the first conduction end of the first switch component is connected to the output end of the lock module, the first conduction end of the first switch component is also connected to the second capacitor, and the second conduction end of the first switch component is grounded.

[0018] The first switch component is configured to be turned on when the first voltage signal is received, and turned off when the second voltage signal is received.

[0019] In some embodiments, the lock module comprises a second switch component, a second diode and a third capacitor.

[0020] The control end of the second switch component is connected to the anode of the second diode, and the control end of the second switch component is also connected to the first end of the third capacitor, and the second end of the third capacitor is grounded.

[0021] The first conduction end of the second switch component is connected to the driving signal of the switch module, the first conduction end of the second switch component is also connected to the cathode of the second diode, and the first conduction end of the second switch component is also connected to the detection module.

[0022] The second conduction end of the second switch component is grounded.

[0023] In some embodiments, the driving module comprises a latch unit and a state driving unit.

[0024] The latch unit is configured to output the driving signal when the lock signal is not received, and bypass the driving signal when the lock signal is received.

[0025] The state driving unit is configured to control the switch module to be turned off when the driving signal is not received, and control the switch module to be turned on when the driving signal is received.

[0026] In some embodiments, the latch unit comprises a threshold setting subunit and a latch subunit; a first end of the threshold setting subunit is connected to an output end of the detection module, and a second end of the threshold setting subunit is connected to the latch subunit;

[0027] The threshold setting subunit is configured to be turned on when the lock signal is received.

[0028] The latch subunit is configured to output the drive signal when the lock signal is not received, and bypass the drive signal when the lock signal is received.

[0029] In some embodiments, the latch subunit comprises a third switch component and a fourth switch component.

[0030] A control end of the third switch component is connected to the second end of the threshold setting subunit, a first conduction end of the third switch component is connected to the control end of the state driving unit, the first conduction end of the third switch component is also connected to a control end of the fourth switch component, and a second conduction end of the third switch component is grounded.

[0031] A first conduction end of the fourth switch component is connected to the drive signal of the switch module, and a second conduction end of the fourth switch component is connected to the second end of the threshold setting subunit.

[0032] In some embodiments, the state driving unit comprises a triode.

[0033] A base of the triode is connected to the output end of the latch unit, a collector of the triode is connected to the control end of the switch module, and an emitter of the triode is grounded.

[0034] In a second aspect, the present application provides an energy storage power supply, which comprises the switch module control circuit of any one of the first aspect and a power supply circuit; the power supply circuit is configured to provide a power supply voltage; and the switch module control circuit is configured to deliver the power supply voltage to a load.

[0035] In the technical scheme provided by the embodiments of the present application, the overcurrent protection element is configured to be disconnected when the current output by the power supply circuit is greater than the preset current threshold, so as to disconnect the power supply circuit; the detection module is configured to output the lock signal in the case that the power supply circuit is disconnected; and the drive module is configured to control the switch module to be disconnected when the lock signal is received, so that the switch module can be cut off in the case that the power supply circuit is disconnected, i.e., the zero-current cut-off of the switch module is realized, so as to reduce the current in the power supply circuit to zero before the switch module is disconnected, and then disconnect the switch module, thereby realizing the zero-current cut-off of the switch module and avoiding the situation that the switch module cuts off a large current, and the reliability of the switch module on the power supply circuit is improved. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 The circuit structure schematic diagram of the switch module control circuit provided for some embodiments is shown in the following figure.

[0038] Figure 2 The circuit structure schematic diagram of the switch module control circuit provided for the second embodiment is shown in the following figure.

[0039] Figure 3 The circuit structure schematic diagram of the switch module control circuit provided for the third embodiment is shown in the following figure.

[0040] Figure 4 The circuit structure schematic diagram of the switch module control circuit provided for the fourth embodiment is shown in the following figure.

[0041] Figure 5 The circuit structure schematic diagram of the switch module control circuit provided for the fifth embodiment is shown in the following figure.

[0042] Figure 6 The circuit structure schematic diagram of the switch module control circuit provided for the sixth embodiment is shown in the following figure.

[0043] Figure 7 The circuit structure schematic diagram of the switch module control circuit provided for the seventh embodiment is shown in the following figure.

[0044] Figure 8 The structure schematic diagram of the energy storage power supply provided for some embodiments is shown in the following figure. DETAILED DESCRIPTION

[0045] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.

[0047] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified. In the description of the embodiments of the present application, "each" means each or each of the plurality, unless otherwise explicitly specified.

[0048] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily mutually exclusive or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0049] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0050] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] In the power supply circuit of the energy storage power supply, in order to control the power-on and power-off of the load connected with the energy storage power supply, a switch module needs to be set on the power supply circuit of the energy storage power supply. The load is powered on by controlling the switch module on the power supply circuit to be turned on, and the load is powered off by controlling the switch module on the power supply circuit to be turned off. Exemplarily, the switch module can include a relay, a circuit breaker, a contactor, a switch, a push button switch or a semiconductor switch, etc. In some embodiments, since the driving coil of the relay and the main circuit contact are completely isolated, the relay becomes the commonly used switch module on the power supply circuit of the energy storage power supply.

[0052] Taking a relay as an example of the switch module, when the coil of the relay is powered, the coil generates a magnetic field to magnetize the iron core, attract the armature to move, force the contacts to stick, that is, the relay is turned on; when the coil of the relay is powered off, the relay contacts are disconnected, that is, the relay is turned off. However, the relay cannot cut off a large current, otherwise the relay contacts may spark, arc, and the like, thereby causing the contact resistance to become large or the contacts to stick, thereby affecting the reliability of the relay. In addition, other types of switches other than the relay can also have the problem of reduced reliability when cutting off a large current.

[0053] Based on this, the switch module control circuit provided by the embodiments of the present application can reduce the current in the power supply circuit to zero before the switch module is disconnected, and then disconnect the switch module, thereby realizing zero-current turn-off of the switch module, avoiding the situation of cutting off a large current by the switch module, and improving the reliability of the switch module on the power supply circuit.

[0054] Figure 1 The circuit structure diagram of the switch module control circuit provided for some embodiments is shown in FIG. 1, which includes a power supply circuit (i.e., two lines connected to the power supply end and the load end in the power supply circuit), a locking module, a detection module, and a driving module. Figure 1 Figure 1 The power supply circuit is arranged between the power supply end and the load end, and the switch module and the overcurrent protection element FA1 are arranged on the power supply circuit; the overcurrent protection element FA1 is used to disconnect when the current output by the power supply circuit is greater than a preset current threshold.

[0055] The locking module is used to output a locking signal when the driving signal of the switch module is high, wherein the high level is the signal corresponding to the driving of the switch module.

[0056] The detection module is used to bypass the locking signal when the power supply circuit is turned on.

[0057] The driving module is used to control the switch module to be disconnected when the locking signal is received, and control the switch module to be turned on based on the driving signal when the locking signal is not received.

[0058] The switch module control circuit can be included in any device capable of supplying power to a load. For example, the switch module control circuit can be included in an energy storage power supply.

[0059] The power supply circuit can include a live wire and a neutral wire, and the live wire of the power supply circuit is arranged between the power supply end and the load end, and the neutral wire of the power supply circuit is arranged between the power supply end and the load end.

[0060] ​The power supply end is configured to be connected to a power supply device. The power supply device can be included in the energy storage power supply, or the power supply device can be a device other than the energy storage power supply or a power grid system. The power supply device is configured to supply power to the power supply end. The power supply circuit is configured to transmit electrical energy to the load end. The load end is configured to be connected to one or more loads, and the load end supplies power to the connected loads. In this way, the switch module control circuit can control the power supply of the power supply device to the load.

[0061] One or more switch modules can be provided on the power supply circuit. For example, two switch modules can be provided on the power supply circuit, one on the live wire of the power supply circuit and the other on the neutral wire of the power supply circuit.

[0062] The overcurrent protection element FA1 on the power supply circuit can include a fuse. The fuse can be disconnected when the current output by the power supply circuit is greater than a preset current threshold. In some embodiments, the fuse can include a self-restoring fuse. When the self-restoring fuse is disconnected, if the current output by the power supply circuit is less than the preset current threshold, the self-restoring fuse in the disconnected state is restored to be conductive. In other embodiments, the fuse can include a non-restorable fuse, which cannot be restored to be conductive again when it is disconnected.

[0063] The overcurrent protection element FA1 can be provided on the live wire or the neutral wire of the power supply circuit, and the embodiments of the present application do not limit this.

[0064] The detection end of the detection module can be connected to the power supply circuit, the input end of the detection module can be connected to the output end of the lock module, the output end of the detection module can be connected to the input end of the drive module, and the output end of the drive module can be connected to the control end of the switch module. In the case where multiple switch modules are provided on the power supply circuit, the control ends of the multiple switch modules are connected to the output end of the drive module.

[0065] The drive signal of the switch module can be input to the control end of the drive module. The drive module is configured to provide a corresponding control signal (for example, a signal for controlling the conduction or disconnection of the switch module) to the control end of the switch module based on the drive signal of the switch module. For example, when the drive signal is at a high level and the high-level drive signal is not bypassed, the drive module inputs a conduction signal to the switch module based on the drive signal to make the switch module conductive. For example, when the drive signal is at a high level and the high-level drive signal is bypassed, or when the drive signal is at a low level, the drive module cannot obtain the high-level drive signal, and inputs a disconnection signal to the switch module to make the switch module disconnected.

[0066] The high level in the embodiments of the present application is a signal corresponding to the conduction of the driving switch module. It can be understood that the driving signal at the high level is a necessary condition for triggering the conduction of the switch module. Only when the driving signal is at the high level, the switch module can be turned on. For example, the driving module can support the control of the switch module to turn on based on the driving signal at the high level.

[0067] The driving signal of the switch module can be connected to the input end of the locking module. The locking module is configured to output a locking signal based on the driving signal at the high level. The locking signal can be a high voltage signal. The voltage corresponding to the locking signal can be less than or equal to the voltage corresponding to the driving signal at the high level. The locking module is further configured to no longer output the locking signal based on the driving signal at the low level. For example, the low level signal is no longer output. In some embodiments, the locking signal can be a low voltage signal, which is not limited.

[0068] In some embodiments, the driving signal at the high level can be provided by the power supply device connected to the power supply end when the power supply device is running. In some other embodiments, the driving signal at the high level can be provided by the controller of the energy storage power supply (not shown in the figure). Figure 1

[0069] The driving signal in the embodiments of the present application refers to the driving signal at the high level unless otherwise specified.

[0070] The detection module can bypass the locking signal when the power supply circuit is turned on. The detection module can also output the locking signal when the power supply circuit is disconnected, so that the driving module obtains the locking signal. The bypassing of the locking signal can include grounding the locking signal, or shielding the locking signal, or not transmitting the locking signal to the driving module.

[0071] The driving module is configured to control the switch module to be disconnected based on the driving signal and the locking signal when the locking signal is received. For example, the driving module can be configured to bypass the driving signal when the locking signal is received, and output a disconnection signal to the switch module according to the bypassed driving signal, so that the switch module is disconnected based on the disconnection signal. For example, the driving module can be configured to output a conduction signal to the switch module based on the driving signal when the locking signal is not received, so that the switch module is turned on based on the conduction signal.

[0072] ​The working principle of the switch module control circuit is explained as follows: in the case that the current output by the power supply circuit is less than or equal to the preset current threshold, the switch module can be cut off under the current, for example, the controller can set the drive signal to a low level, the low level is a signal corresponding to the disconnection of the drive switch signal, and the drive module controls the switch module to be disconnected according to the low-level drive signal. However, in the case of load short circuit or power supply abnormality, the current output by the power supply circuit may be greater than the preset current threshold, and the cut-off of the switch module under the current will affect the performance of the switch module. Therefore, in the case that the current output by the power supply circuit is greater than the preset current threshold, the overcurrent protection element FA1 is disconnected to disconnect the power supply circuit, the detection module outputs a lock signal in the case that the power supply circuit is disconnected, and the drive module controls the switch module to be disconnected when the lock signal is received. In this way, the switch module can be cut off in the case that the power supply circuit is disconnected, that is, the zero-current cut-off of the switch module is realized.

[0073] In the technical scheme provided by the embodiment of the application, the overcurrent protection element FA1 is used to disconnect in the case that the current output by the power supply circuit is greater than the preset current threshold, so as to disconnect the power supply circuit, the detection module is used to output a lock signal in the case that the power supply circuit is disconnected, and the drive module controls the switch module to be disconnected when the lock signal is received. In this way, the switch module can be cut off in the case that the power supply circuit is disconnected, that is, the zero-current cut-off of the switch module is realized, so that the current in the power supply circuit is reduced to zero before the switch module is disconnected, and then the switch module is disconnected, realizing the zero-current cut-off of the switch module, avoiding the situation that the switch module cuts off a large current, and improving the reliability of the switch module on the power supply circuit.

[0074] In addition, in the technical scheme provided by the embodiment of the application, the power supply circuit can be disconnected in time when the current output by the power supply circuit is greater than the preset current threshold, avoiding the impact of a large current on the load and reducing the damage probability of the load.

[0075] Figure 2 The circuit structure schematic diagram of the switch module control circuit provided for the second embodiment is shown in FIG. 2. Figure 2 As shown in FIG. 2, Figure 2 Compared with the first embodiment, Figure 1 The difference lies in that the detection module comprises a signal detection unit and a bypass unit.

[0076] The signal detection unit is configured to output a first voltage signal when the power supply circuit is turned on, and output a second voltage signal when the power supply circuit is disconnected.

[0077] The bypass unit is configured to bypass the lock signal when the first voltage signal is received, and output the lock signal when the second voltage signal is received.

[0078] The detection end of the signal detection unit can be connected to the power supply circuit, the output end of the signal detection unit can be connected to the control end of the bypass unit, the input end of the bypass unit can be connected to the output end of the locking module, and the output end of the bypass unit can be connected to the input end of the driving module.

[0079] Exemplarily, the first voltage signal is a high voltage signal, and the second voltage signal is a low voltage signal. Exemplarily, the first voltage signal is a low voltage signal, and the second voltage signal is a high voltage signal.

[0080] The bypass unit can connect the output end of the locking module to the ground end to bypass the locking signal when the first voltage signal is received. The bypass unit can disconnect the output end of the locking module from the ground end and output the locking signal to enable the driving module to receive the locking signal when the second voltage signal is received.

[0081] In the technical scheme provided by the embodiments of the present application, through the cooperative work of the signal detection unit and the bypass unit, the bypassing or outputting of the locking signal can be automatically completed based on the on-off working state of the power supply circuit, the abnormal locking signal of the power supply circuit in different working states is effectively avoided, and the mis-disconnection of the switching module caused by the abnormal locking signal is further avoided, thereby affecting the reliability of the operation of the power supply circuit.

[0082] Figure 3 The circuit structure schematic diagram of the switching module control circuit provided for the third embodiment is shown in FIG. 3. Figure 3 As shown in FIG. 3, Figure 3 Compared with the first embodiment, Figure 2 The difference lies in that the signal detection unit comprises an optocoupler U1, a first diode D1 and a first capacitor C1; the anode of the optocoupler U1 is connected to the live wire of the power supply circuit, the cathode of the optocoupler U1 is connected to the neutral wire of the power supply circuit, the collector of the optocoupler U1 is connected to a target voltage (VCC), the emitter of the optocoupler U1 is connected to the bypass unit, and the emitter of the optocoupler U1 is further connected to the first capacitor C1; the anode of the first diode D1 is connected to the cathode of the optocoupler U1, and the cathode of the first diode D1 is connected to the anode of the optocoupler U1.

[0083] In some embodiments, the signal detection unit can further comprise a resistor R1 and a resistor R2. The anode of the optocoupler U1 can be connected to the live wire of the power supply circuit through the resistor R1. The collector of the optocoupler U1 is connected to the target voltage through the resistor R2.

[0084] The target voltage can be a direct current voltage (VCC), and exemplarily, the target voltage can be provided by a controller. In some embodiments, the target voltage (VCC) is also connected to another control end of the switching device.

[0085] The first end of the first capacitor C1 is connected to the emitter of the optocoupler U1, and the second end of the first capacitor C1 is connected to the ground (GND).

[0086] Figure 3 Compared to Figure 2 The difference also lies in the following: the bypass unit includes a first switching assembly and a second capacitor C2; the control terminal of the first switching assembly is connected to the output terminal of the signal detection unit, the first conducting terminal of the first switching assembly is connected to the output terminal of the locking module, the first conducting terminal of the first switching assembly is also connected to the second capacitor C2, and the second conducting terminal of the first switching assembly is grounded; the first switching assembly is used to turn on when a first voltage signal is received and to turn off when a second voltage signal is received. In some embodiments, the first conducting terminal of the first switching assembly is connected to the first terminal of the second capacitor C2, and the second terminal of the second capacitor C2 is grounded.

[0087] In some embodiments, the first switching assembly may include resistors R3 and R4, and an NPN transistor Q1. The emitter of the optocoupler U1 is connected to the base of the NPN transistor Q1 through resistor R3, and the base of the NPN transistor Q1 is grounded through resistor R4. The collector of the NPN transistor Q1 is connected to the output of the locking module, and the emitter of the NPN transistor Q1 is grounded. The NPN transistor can be turned on based on a high voltage signal to ground the locking signal output by the locking module, thereby bypassing the locking signal; and turned off based on a low level signal to output the locking signal.

[0088] Resistor R4 is the base pull-down resistor for NPN transistor Q1, preventing Q1 from being mistakenly turned on. The second capacitor C2 is a filter capacitor for the lock-in signal, preventing the lock-in signal from being output when it is briefly present.

[0089] Please continue reading. Figure 3 The working principle of the switch module control circuit in the embodiments of this application is explained as follows:

[0090] When the current output by the power supply circuit is less than or equal to the preset current threshold, the overcurrent protection element FA1 is turned on, and the power supply circuit is turned on. Since the current in the power supply circuit is alternating current, the anode of the first diode D1 is connected to the cathode of the optocoupler U1, and the cathode of the first diode D1 is connected to the anode of the optocoupler U1. Thus, the primary side of the optocoupler U1 is periodically turned on. When the primary side of the optocoupler U1 is turned on, the internal light-emitting diode emits light, causing the secondary side of the optocoupler U1 to be periodically turned on, that is, the collector and emitter are periodically turned on during the optocoupler period. During the periodic conduction of the collector and emitter during the optocoupler period, the target voltage charges the first capacitor C1 when the collector and emitter of the optocoupler U1 are turned on. When the collector and emitter of the optocoupler U1 are disconnected, the first capacitor C1 discharges, so the base of the NPN transistor Q1 receives a high voltage signal, and the NPN transistor Q1 turns on, bypassing the locking signal output by the locking module.

[0091] When the current output by the power supply circuit is greater than the preset current threshold, the overcurrent protection element FA1 is disconnected, the power supply circuit is disconnected, thereby the primary side of the optocoupler U1 is disconnected, causing the secondary side of the optocoupler U1 to be disconnected, the collector and the emitter of the optocoupler U1 are disconnected, thereby the base of the NPN transistor Q1 obtains a low voltage signal, the NPN transistor Q1 is disconnected, and the obtained locking signal is output.

[0092] Next, the locking module in the above embodiment is described. Figure 4 The circuit structure schematic diagram of the switch module control circuit provided for the fourth embodiment is shown in Figure 4 , and the difference between the fourth embodiment and the third embodiment is that the locking module comprises a second switch assembly, a second diode D2 and a third capacitor C3. Figure 4 Figure 1 The control end of the second switch assembly is connected to the anode of the second diode D2, and the control end of the second switch assembly is also connected to the first end of the third capacitor C3, and the second end of the third capacitor C3 is grounded.

[0093] The first conduction end of the second switch assembly is connected to the driving signal of the switch module, and the first conduction end of the second switch assembly is also connected to the cathode of the second diode D2 and the detection module.The second conduction end of the second switch assembly is grounded.

[0094] In some embodiments, the second switch assembly can comprise a resistor R5, a resistor R6 and a PNP transistor Q2. The base of the PNP transistor Q2 is connected to the anode of the second diode D2 through the resistor R6, and the base of the PNP transistor Q2 is also connected to the first end of the third capacitor C3 through the resistor R6. The emitter of the PNP transistor Q2 is connected to the driving signal of the switch module through the resistor R5, and the emitter of the PNP transistor Q2 is also connected to the cathode of the second diode D2 through the resistor R5. The emitter of the PNP transistor Q2 is connected to the input end of the detection module as the output end of the locking module. The collector of the PNP transistor Q2 is also grounded.

[0095] Please continue to refer to Figure 4 , and the switch module control circuit is described in combination with the circuit structure schematic diagram of the locking module.

[0096] Since the emitter of the PNP transistor Q2 is connected to the driving signal (exemplified by the V_REL signal) of the switch module through the resistor R5, when the V_REL signal is at a high level, the PNP transistor Q2 works in a reverse bias state, the V_REL signal flows to the third capacitor C3 through the resistor R5, the base of the PNP transistor Q2 and the resistor R6, the PNP transistor Q2 is turned on, and the V_R0 voltage (i.e. the lock signal) is pulled down to the ground. When the V_R0 voltage is pulled down to the ground, the V_R0 voltage cannot be output until the voltage at the first end of the third capacitor C3 reaches a voltage at which the PNP transistor Q2 is turned off, so as to make the lock module output the V_R0 voltage.

[0097] Exemplarily, by setting the parameters of the third capacitor C3 and the resistor R6, the turn-on and turn-off of the PNP transistor Q2 can be controlled, so as to achieve the purpose of delaying the arrival of the V_R0 voltage to the driving module.

[0098] Exemplarily, when the V_REL signal is an invalid low level, the third capacitor C3 is discharged through the second diode D2, so as to realize the reset of the circuit. When the next V_REL signal is at a valid high level, the delay function is realized again.

[0099] In the embodiments of the present application, the detection module, the driving module and the lock module are combined. Figure 3 and Figure 4 Since the lock module can delay the output of the lock signal, the lock signal can be prevented from being transmitted to the driving module before the NPN transistor Q1 is turned on, so as to avoid the misoperation of the driving module to the switch module.

[0100] Next, the driving module in the above embodiment is described. Figure 5 The circuit structure schematic diagram of the switch module control circuit provided by the fifth embodiment is shown in Figure 5 , and Figure 5 Compared with Figure 1 , the difference lies in that the driving module comprises a latch unit and a state driving unit. The latch unit is used to output a driving signal when no lock signal is received, and bypass the driving signal when the lock signal is received. The state driving unit is used to control the switch module to be turned off when no driving signal is received, and control the switch module to be turned on when the driving signal is received.

[0101] The input end of the latch unit is connected to the output end of the detection module, the output end of the latch module is connected to the control end of the state driving unit, and the output end of the state driving unit is connected to the control end of the switch module. For example, the first turn-on end (i.e. the output end) of the state driving unit is connected to the control end of the switch module, and the second turn-on end of the state driving unit is connected to the ground.

[0102] The latch unit is used to bypass the driving signal continuously when the locking signal is received until the driving signal is converted to low. That is, the latch unit can latch the bypass state of the driving signal, so that the latch unit can maintain bypassing the driving signal all the time before the driving signal is converted to low.

[0103] Exemplarily, the state driving unit can be turned off when the driving signal is not received, so that the control end of the switch module is turned off. The state driving unit can be turned on when the driving signal is received, so that the driving signal of the control end of the switch module is pulled down to the ground, and the switch module is turned on.

[0104] In the technical scheme provided by the embodiment of the application, the latch unit bypasses the driving signal when the locking signal is received. Thus, even if the current output by the power supply circuit is greater than the preset current threshold value and then is less than or equal to the preset current threshold value again, the overcurrent protection element FA1 is turned on again, and the detection module bypasses the locking signal again, the latch unit can still maintain bypassing the driving signal to continuously lock the off state of the switch module until the driving signal is low. Only when the driving signal is low, the latch unit no longer locks the switch module to be in the off state, thereby avoiding the impact on the load caused by the continuous power supply and power-off of the load.

[0105] The latch unit is explained as follows: Figure 6 The circuit structure schematic diagram of the switch module control circuit provided for the sixth embodiment is shown in FIG. 6. Figure 6 As shown in FIG. 6, Figure 6 Compared with Figure 5 The difference lies in that: the latch unit comprises a threshold setting subunit and a latch subunit; the first end of the threshold setting subunit is connected to the output end of the detection module, and the second end of the threshold setting subunit is connected to the latch subunit; the threshold setting subunit is used to turn on when the locking signal is received; the latch subunit is used to output the driving signal when the locking signal is not received, and bypass the driving signal when the locking signal is received.

[0106] Exemplarily, the threshold setting subunit is used to turn off when a voltage signal less than the locking signal is received. Exemplarily, the threshold setting subunit can comprise a zener diode ZD1. The zener diode ZD1 can be broken down by the locking signal, and the zener diode ZD1 is turned off when a voltage signal less than the locking signal is received. Exemplarily, the first end of the threshold setting subunit can be the cathode of the zener diode ZD1, and the second end of the threshold setting subunit can be the anode of the zener diode ZD1.

[0107] The control end of the latch subunit can be connected to the second end of the threshold setting subunit, the input end of the latch subunit is connected to the driving signal, and the output end of the latch subunit is connected to the control end of the state driving unit.

[0108] Figure 6 Compared to Figure 5 The difference also lies in the following: the latching subunit includes a third switch component and a fourth switch component; the control terminal of the third switch component is connected to the second terminal of the threshold setting subunit, the first conducting terminal of the third switch component is connected to the control terminal of the state driving unit, the first conducting terminal of the third switch component is also connected to the control terminal of the fourth switch component, and the second conducting terminal of the third switch component is grounded; the first conducting terminal of the fourth switch component is connected to the drive signal of the switch module, and the second conducting terminal of the fourth switch component is connected to the second terminal of the threshold setting subunit.

[0109] The third switching assembly includes resistor R7 and NPN transistor Q3. The fourth switching assembly includes resistors R8 and R9, and PNP transistor Q4.

[0110] In this configuration, the base of NPN transistor Q3 is connected to the anode of Zener diode ZD1 via resistor R7. The base of NPN transistor Q3 is also connected to the collector of PNP transistor Q4 via resistor R7. The collector of PNP transistor Q4 is connected to the anode of Zener diode ZD1. The collector of NPN transistor Q3 is connected to the drive signal via resistor R8. The collector of NPN transistor Q3 is also connected to the emitter of PNP transistor Q4 via resistor R8. The collector of NPN transistor Q3 is connected to the base of PNP transistor Q4 via resistor R9. The emitter of NPN transistor Q3 is grounded.

[0111] Figure 6 Compared to Figure 5 The difference also lies in the fact that the state driving unit includes a transistor ( Figure 6 The transistor shown is an NPN transistor Q5; the base of the transistor (NPN transistor Q5) is connected to the output terminal of the latch unit, the collector of the transistor (NPN transistor Q5) is connected to the control terminal of the switching module, and the emitter of the transistor (NPN transistor Q5) is grounded.

[0112] For example, resistor R7 limits the base current flowing through NPN transistor Q3 after the lockout signal breaks down Zener diode ZD1. Resistor R8 limits the base current of NPN transistor Q5 to the V_REL signal. Resistor R9 is a current-limiting resistor.

[0113] Please continue reading. Figure 6 Based on the circuit structure diagram of the drive module, the control circuit of the switch module is explained:

[0114] When the Zener diode ZD1 does not receive a lock signal, the Zener diode ZD1 will not be broken down, the NPN transistor Q3 is in the off state, the high-level drive signal (V_REL signal) is transmitted to the base of the NPN transistor Q5 through the resistor R8, the NPN transistor Q5 is turned on, the high-level drive signal (V_REL signal) connected to the control terminal of the switching module is grounded, and the switching module is turned on.

[0115] When the Zener diode ZD1 receives the lockout signal, it breaks down, and the NPN transistor Q3 turns on. This causes the high-level drive signal (V_REL signal) to pass through the PNP transistor Q4, which in turn sinks voltage to the base of the NPN transistor Q3 through resistor R7, keeping Q3 continuously conducting. In other words, after the lockout signal triggers the NPN transistor Q3 to turn on, as long as the V_REL signal is high, the switch module remains locked in its off state until the V_REL signal resets to low, at which point the thyristor lock formed by the NPN transistor Q3 and the PNP transistor Q4 will reset.

[0116] Figure 7 A schematic diagram of the circuit structure of the switch module control circuit provided in the seventh embodiment is shown below. Figure 7 As shown, Figure 7 The switching module control circuit is as described above. Figure 3 , Figure 4 as well as Figure 6 Combinations of examples. Figure 7 The system includes two switching modules, for example, both of which are relays, namely relay RLY1 and relay RLY2. One end of the coil of relay RLY1 and relay RLY2 is connected to the V_REL+ signal (the potential values ​​corresponding to the V_REL+ signal and the V_REL signal can be different or the same), and the other end is connected to VCC. When transistor Q5 is off, the V_REL+ signal is floating, and the coils of relays RLY1 and RLY2 do not form a power supply circuit; at this time, relays RLY1 and RLY2 are in the off state. When transistor Q5 is on, and the V_REL+ signal is pulled down to ground, the coils of relays RLY1 and RLY2 form a power supply circuit, and relays RLY1 and RLY2 are turned on.

[0117] The following combination Figure 7 In this embodiment, taking a relay as an example, the working principle of the switch module control circuit is explained:

[0118] In the case that the power supply end is powered and the driving signal V_REL signal is high, the high driving signal V_REL signal drives the NPN transistor Q5 to turn on, so that the one end of the coil of the relay RLY1 and RLY2 connected to the V_REL+ signal is pulled down to the ground, and the relays RLY1 and RLY2 are turned on. In the locking module, the V_REL signal flows to the third capacitor C3 through the resistor R4, the base of the PNP transistor Q2 and the resistor R5, the PNP transistor Q2 is turned on, and the V_R0 voltage (i.e. the locking signal) is pulled down to the ground. When the V_R0 voltage is pulled down to the ground, the V_R0 voltage cannot be output until the voltage at the first end of the third capacitor C3 reaches the voltage at which the PNP transistor Q2 is turned off, so that the PNP transistor Q2 is turned off, and the locking module outputs the V_R0 voltage. That is, the locking module can delay the output of the V_R0 voltage, so that when the locking module outputs the V_R0 voltage, the NPN transistor Q1 has not yet been turned on, the V_R0 voltage can break down the zener diode ZD1, the NPN transistor Q3 is turned on, the base level of the NPN transistor Q5 is pulled low, the NPN transistor Q5 is turned off, the V_REL+ signal is in a floating state, and the relays RLY1 and RLY2 cannot be turned on. That is, the delay module in the embodiment of the application outputs the V_R0 voltage to the detection module after the NPN transistor Q1 is turned on, so that the NPN transistor Q1 can reliably ground the V_R0 voltage, i.e. bypass the V_R0 voltage.

[0119] In the case that the power supply end is powered and the power supply circuit is disconnected, the driving signal is still high, but because the power supply circuit is disconnected, the voltage at the base of the NPN transistor Q1 is 0, the NPN transistor Q1 is turned off, the V_R0 voltage can break down the zener diode ZD1, the NPN transistor Q3 is turned on, the base level of the NPN transistor Q5 is pulled low, the NPN transistor Q5 is turned off, and the relays RLY1 and RLY2 are turned off. Thus, the zero-current turn-off of the relays RLY1 and RLY2 is realized.

[0120] Figure 8 For some embodiments, a structural schematic diagram of an energy storage power supply is provided, as shown in Figure 8 The energy storage power supply includes the switch module control circuit and the power supply circuit in any of the above embodiments; the power supply circuit is configured to provide a power supply voltage; and the switch module control circuit is configured to deliver the power supply voltage to a load.

[0121] Exemplarily, the power supply circuit can be connected to the power supply end of the switch module control circuit. Exemplarily, the power supply circuit can include an inverter circuit, and the inverter circuit can be connected to a battery module. The inverter circuit is configured to convert direct current output by the battery module into alternating current, and input the alternating current to the power supply end.

[0122] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, any combination of these technical features is deemed to be within the scope of the present application.

[0123] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A switch module control circuit, characterized by, The switch module control circuit comprises a power supply circuit, a locking module, a detection module and a driving module; the power supply circuit is arranged between a power supply end and a load end, and a switch module and an overcurrent protection element are arranged on the power supply circuit; the overcurrent protection element is used to disconnect when the current output by the power supply circuit is greater than a preset current threshold; The locking module is used to output a locking signal when the driving signal of the switch module is a high level, wherein the high level is a signal corresponding to driving the switch module to be turned on; The detection module is used to bypass the locking signal when the power supply circuit is turned on; The driving module is used to control the switch module to be disconnected when the locking signal is received, and to control the switch module to be turned on based on the driving signal when the locking signal is not received.

2. The switch module control circuit of claim 1, wherein, The detection module comprises a signal detection unit and a bypass unit; The signal detection unit is used to output a first voltage signal when the power supply circuit is turned on, and to output a second voltage signal when the power supply circuit is disconnected; The bypass unit is used to bypass the locking signal when the first voltage signal is received, and to output the locking signal when the second voltage signal is received.

3. The switch module control circuit of claim 2, wherein, The signal detection unit comprises an optocoupler, a first diode and a first capacitor; The anode of the optocoupler is connected to the live wire of the power supply circuit, the cathode of the optocoupler is connected to the neutral wire of the power supply circuit, the collector of the optocoupler is connected to a target voltage, the emitter of the optocoupler is connected to the bypass unit, and the emitter of the optocoupler is also connected to the first capacitor; The anode of the first diode is connected to the cathode of the optocoupler, and the cathode of the first diode is connected to the anode of the optocoupler.

4. The switch module control circuit of claim 2, wherein, The bypass unit comprises a first switch assembly and a second capacitor; The control end of the first switch assembly is connected to the output end of the signal detection unit, the first conduction end of the first switch assembly is connected to the output end of the locking module, the first conduction end of the first switch assembly is also connected to the second capacitor, and the second conduction end of the first switch assembly is grounded; The first switch assembly is used to be turned on when the first voltage signal is received, and to be disconnected when the second voltage signal is received.

5. The switch module control circuit of any one of claims 1 to 4, wherein, The locking module comprises a second switch assembly, a second diode and a third capacitor; The control end of the second switch assembly is connected to the anode of the second diode, and the control end of the second switch assembly is also connected to the first end of the third capacitor, and the second end of the third capacitor is grounded; The first conduction end of the second switch assembly is connected to the driving signal of the switch module, the first conduction end of the second switch assembly is also connected to the cathode of the second diode, and the first conduction end of the second switch assembly is also connected to the detection module; The second conduction end of the second switch assembly is grounded.

6. The switch module control circuit of any one of claims 1 to 4, wherein, The driving module comprises a latching unit and a state driving unit; The latching unit is used to output the driving signal when the locking signal is not received, and to bypass the driving signal when the locking signal is received; The state driving unit is configured to control the switch module to be off when the driving signal is not received, and to be on when the driving signal is received.

7. The switch module control circuit of claim 6, wherein, The latch unit comprises a threshold setting subunit and a latch subunit; a first end of the threshold setting subunit is connected to an output end of the detection module, and a second end of the threshold setting subunit is connected to the latch subunit; The threshold setting subunit is configured to be on when a lock signal is received. The latch subunit is configured to output the driving signal when the lock signal is not received, and to bypass the driving signal when the lock signal is received.

8. The switch module control circuit of claim 7, wherein, The latch subunit comprises a third switch assembly and a fourth switch assembly; A control end of the third switch assembly is connected to the second end of the threshold setting subunit, a first conduction end of the third switch assembly is connected to a control end of the state driving unit, the first conduction end of the third switch assembly is also connected to a control end of the fourth switch assembly, and a second conduction end of the third switch assembly is grounded; A first conduction end of the fourth switch assembly is connected to the driving signal of the switch module, and a second conduction end of the fourth switch assembly is connected to the second end of the threshold setting subunit.

9. The switch module control circuit of claim 6, wherein, The state driving unit comprises a transistor; A base of the transistor is connected to an output end of the latch unit, a collector of the transistor is connected to a control end of the switch module, and an emitter of the transistor is grounded.

10. An energy storage power supply, characterized by, The energy storage power supply comprises the switch module control circuit and the power supply circuit according to any one of claims 1 to 9. The power supply circuit is configured to provide a power supply voltage. The switch module control circuit is configured to deliver the power supply voltage to a load.

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