Overvoltage latch circuit and energy storage power supply

Abstract

The utility model provides an overvoltage latch circuit and an energy storage power supply. The overvoltage latch circuit comprises a latch module, a first switch module, a second switch module and a third switch module, the latch module is used for continuously outputting a first control signal when the system voltage of the system power supply is received and when and after the working voltage of the working power supply is greater than or equal to a first voltage threshold value; the first switch module is used for conducting and outputting a first level signal when receiving a first control signal; the second switch module is used for being cut off when receiving the first level signal; the third switch module is used for being cut off when the second switch module is cut off so as to continuously cut off power supply of the battery to the load. According to the invention, the power supply of the battery to the load can be quickly and continuously cut off when the working power supply is in an overvoltage condition, the possibility of damaging load equipment by overvoltage current is reduced, and the stability of the load is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic circuit technology, and in particular to an overvoltage latch circuit and an energy storage power supply. Background Art

[0002] In practical applications, overvoltage conditions on DC outputs, such as those on a cigarette lighter's USB (Universal Serial Bus) port, can easily cause severe damage to connected circuits. This overvoltage condition can be caused by a variety of factors, including power supply fluctuations, external interference, or device failure. Furthermore, these outputs typically automatically resume output after the overvoltage condition is resolved. This means that if overvoltage conditions occur multiple times in a short period of time, circuits will be subjected to repeated shocks, significantly increasing the risk of damage.

[0003] In traditional solutions, some consider using the processor's IO (Input / Output) ports for overvoltage detection. However, this approach has many disadvantages. On the one hand, using the processor's IO ports for detection will occupy valuable system resources. In modern electronic devices, processors often need to handle many complex tasks. Using their IO ports for overvoltage detection will disperse the processor's processing power, affecting the performance and response speed of the entire system. On the other hand, this approach is costly. In order to achieve accurate overvoltage detection, additional circuit design and software programming are usually required, which not only increases hardware costs, but also increases the time cost of development and debugging. In addition, due to the limited number of processor IO ports, in some resource-constrained systems, it may not be possible to meet the needs of performing multiple tasks and overvoltage detection simultaneously. Utility Model Content

[0004] The embodiments of the present application provide an overvoltage latch circuit and an energy storage power supply, which can quickly and continuously disconnect the battery from supplying power to the load when an overvoltage occurs in the working power supply, thereby reducing the possibility of overvoltage current damaging the load equipment and improving the stability of the load.

[0005] In the first aspect, an embodiment of the present application provides an overvoltage latch circuit, comprising: a latch module, a first switch module, a second switch module, and a third switch module; the latch module is respectively connected to the first switch module, the system power supply, and the working power supply, the first switch module is also connected to the second switch module, the second switch module is connected to the third switch module, and the third switch module is also respectively connected to a battery and a load; the latch module is used to continuously output a first control signal when receiving the system voltage of the system power supply and at and after the working voltage of the working power supply is greater than or equal to a first voltage threshold; the first switch module is used to turn on and output a first level signal when receiving the first control signal; the second switch module is used to turn off when receiving the first level signal; the third switch module is used to turn off when the second switch module is turned off, so as to continuously disconnect the battery from supplying power to the load.

[0006] In some embodiments, the latch module includes: a first voltage divider unit, a second voltage divider unit, and a comparison latch unit; the first voltage divider unit is respectively connected to the system power supply and the inverting input end of the comparison latch unit, the second voltage divider unit is respectively connected to the working power supply and the non-inverting input end of the comparison latch unit, and the output end of the comparison latch unit is connected to the first switch module; the first voltage divider unit is used to divide the received system voltage to output a system divided voltage; the second voltage divider unit is used to divide the received working voltage to output a working divided voltage; the comparison latch unit is used to continuously output the first control signal when the system divided voltage is received and at and after the working divided voltage is greater than or equal to a second voltage threshold.

[0007] In some embodiments, the first voltage divider unit includes: a resistor R5, a resistor R10, and a capacitor C4; the first end of the resistor R5 is connected to the system power supply, the second end of the resistor R5 is respectively connected to the first end of the resistor R10, the first end of the capacitor C4, and the inverting input end of the comparison latch unit, and the second end of the resistor R10 and the second end of the capacitor C4 are both grounded.

[0008] In some embodiments, the second voltage divider unit includes: a resistor R4, a resistor R8, a resistor R9, and a capacitor C3; the first end of the resistor R4 is connected to the working power supply, the second end of the resistor R4 is respectively connected to the first end of the resistor R8, the first end of the resistor R9, the first end of the capacitor C3, and the non-inverting input end of the comparison latch unit, and the second end of the resistor R8, the second end of the resistor R9, and the second end of the capacitor C3 are all grounded.

[0009] In some embodiments, the comparison latch unit includes: a comparator U1A, a resistor R6, and a diode D1; the first end of the resistor R6 is connected to the system power supply, the inverting input end of the comparator U1A is connected to the first voltage divider unit, the non-inverting input end of the comparator U1A is respectively connected to the cathode of the diode D1 and the second voltage divider unit, and the output end of the comparator U1A is respectively connected to the second end of the resistor R6, the anode of the diode D1, and the first switch module.

[0010] In some embodiments, the first switch module includes a switch tube Q3; a control end of the switch tube Q3 is connected to the latch module, a third end of the switch tube Q3 is connected to the second switch module, and a second end of the switch tube Q3 is grounded.

[0011] In some embodiments, the second switch module includes: a switch tube Q2, a resistor R2, a resistor R7, and a capacitor C2; the first end of the resistor R2 is connected to the battery, the control end of the switch tube Q2 is respectively connected to the second end of the resistor R2, the first end of the resistor R7, the first end of the capacitor C2, and the latch module, the third end of the switch tube Q2 is connected to the third switch module, and the second end of the switch tube Q2, the second end of the resistor R7, and the second end of the capacitor C2 are all grounded.

[0012] In some embodiments, the third switch module includes: a switch tube Q1, a resistor R1, and a resistor R3; the second end of the resistor R3 is connected to the second switch module, the control end of the switch tube Q1 is respectively connected to the first end of the resistor R3 and the second end of the resistor R1, the first end of the switch tube Q1 is respectively connected to the first end of the resistor R1 and the battery, and the second end of the switch tube Q1 is connected to the load.

[0013] In some embodiments, the overvoltage latch circuit further includes an overcurrent protection module; the battery is connected to the third switch module through the overcurrent protection module; the overcurrent protection module is used to disconnect the path between the battery and the third switch module when the battery current of the battery is greater than or equal to a first current threshold.

[0014] In a second aspect, an embodiment of the present application further provides an energy storage power supply, comprising the overvoltage latch circuit as described above.

[0015] Different from the solutions in the prior art, the embodiment of the present application provides an overvoltage latch circuit and an energy storage power supply, which includes a latch module, a first switch module, a second switch module, and a third switch module. When the system power supply is supplying power normally, the latch module receives the system voltage of the system power supply. At the same time, the latch module also continuously monitors the working voltage of the working power supply. Once the working voltage of the working power supply is greater than or equal to the first voltage threshold, the latch module will continue to output the first control signal at this moment and thereafter. The first switch module is turned on after receiving the first control signal output by the latch module, and outputs a first level signal. The second switch module is turned off when it receives the first level signal output by the first switch module. Since the second switch module is turned off, the third switch module is also turned off, thereby continuously disconnecting the battery from supplying power to the load, preventing overvoltage from damaging the load. The embodiment of the present application monitors the system voltage of the system power supply and the working voltage of the working power supply through the latch module, and can accurately determine whether the working voltage exceeds the first voltage threshold. When an operating voltage overvoltage is detected, the coordinated action of multiple switch modules can continuously disconnect the battery from supplying power to the load. The continuous latching function ensures that power will not be restored immediately even after the overvoltage state disappears briefly, avoiding intermittent shocks to the load caused by repeated overvoltage, and further protecting the load equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 This is a structural block diagram of an overvoltage latch circuit provided by an embodiment of the present application;

[0018] Figure 2 is a structural block diagram of an overvoltage latch circuit provided by another embodiment of the present application;

[0019] Figure 3 This is a structural block diagram of a latch module provided in one embodiment of the present application;

[0020] Figure 4 1 is a schematic diagram of the circuit structure of the latch module and the first switch module provided in one embodiment of the present application;

[0021] Figure 5 This is a circuit structure diagram of the second switch module, the third switch module, and the overcurrent protection module provided in one embodiment of the present application. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0023] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0024] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0025] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "first," "second," and the like generally distinguish objects of a class and do not limit the number of objects. For example, the first object may be one or more.

[0026] See also Figure 1 , Figure 1 1 is a structural block diagram of an overvoltage latch circuit 100 provided in one embodiment of the present application.

[0027] The overvoltage latch circuit 100 according to the embodiment of the present application includes: a latch module 11 , a first switch module 12 , a second switch module 13 , and a third switch module 14 .

[0028] Among them, the latch module 11 is respectively connected to the first switch module 12, the system power supply 300, and the working power supply 200, the first switch module 12 is also connected to the second switch module 13, the second switch module 13 is connected to the third switch module 14, and the third switch module 14 is also respectively connected to the battery 400 and the load 500.

[0029] Specifically, the latch module 11 is configured to continuously output a first control signal upon receiving the system voltage of the system power supply 300 and at or after the operating voltage of the working power supply 200 is greater than or equal to a first voltage threshold. The first switch module 12 is configured to turn on and output a first level signal upon receiving the first control signal. The second switch module 13 is configured to turn off upon receiving the first level signal. The third switch module 14 is configured to turn off when the second switch module 13 is turned off, thereby continuously disconnecting the battery 400 from supplying power to the load 500.

[0030] The operating power supply 200 typically provides the power required for normal operation of a specific circuit or system. It can be a standalone power module or converted from another power source. In this overvoltage latch circuit, the operating voltage of the operating power supply affects the state of the entire circuit.

[0031] System power supply 300 generally provides basic power for the entire system. In this circuit, the system power supply primarily provides the system voltage for the latch module, thereby triggering its specific functions. The system voltage of system power supply 300 is typically fixed, such as +5V.

[0032] The first voltage threshold is a specific voltage value used to determine whether the operating voltage of the working power supply is outside the normal range. When the operating voltage of the working power supply is greater than or equal to this threshold, a series of subsequent circuit actions will be triggered to protect the load from excessive voltage. This threshold is typically set based on the operating requirements of the load and the safety performance of the circuit. The first voltage threshold can be changed by changing the components in the overvoltage latch circuit 100, the connection relationship between the components, the parameters of the components, etc. For example, the first voltage threshold can be 16V, etc.

[0033] The first control signal is generated and output by the latch module 11. When the latch module 11 receives the system voltage of the system power supply and the operating voltage of the operating power supply is greater than or equal to the first voltage threshold, and thereafter, the latch module 11 continuously outputs the first control signal. The first control signal is used to control the conduction of the first switch module 12.

[0034] The first level signal is the signal output by the first switch module 12 after it is turned on upon receiving the first control signal. The first level signal further affects the operating state of the second switch module 13. The specific level may vary depending on the circuit design and is generally used to convey specific status information within the circuit.

[0035] In actual applications, if the operating voltage of the working power supply (e.g., 13.6V) is less than the first voltage threshold (e.g., 16V), the latch module 11 does not output the first control signal, the first switch module is turned off, and no first level signal is generated. The second switch module is turned on, and the third switch module is also turned on, and the battery can normally power the load.

[0036] When an abnormality occurs in the working power supply and its working voltage is greater than or equal to the first voltage threshold, the latch module 11 is triggered. Since the latch module 11 is connected to the system power supply 300 and the working power supply 200, after the triggering condition is met (i.e., the system voltage of the system power supply 300 is received and the working voltage is greater than or equal to the first voltage threshold), the latch module 11 continues to output the first control signal. The first switch module 12 is turned on after receiving the first control signal and outputs a first level signal. The second switch module 13 is cut off after receiving the first level signal. Since the second switch module 13 is cut off, the third switch module 14 is also cut off, thereby continuously disconnecting the battery 400 from supplying power to the load 500. This can prevent the excessively high working voltage from being transmitted to the load 500 through the battery 400, thereby preventing the load 500 from being damaged due to overvoltage.

[0037] Once the operating voltage of the working power supply 200 exceeds the first voltage threshold, causing the circuit to enter the overvoltage protection state, the latch module 11 will continue to output the first control signal, maintaining the states of the first switch module 12, the second switch module 13, and the third switch module 14 unchanged until manual intervention or power is restored to the system power supply 300, which satisfies the conditions for restoring normal power supply to the circuit. This latching function ensures that the load 500 remains in a safe state until the overvoltage condition is eliminated, and is not repeatedly subjected to overvoltage shocks due to fluctuations in the working power supply voltage.

[0038] See also Figure 2 , Figure 2 1 is a structural block diagram of an overvoltage latch circuit 100 provided in another embodiment of the present application.

[0039] In some embodiments, the overvoltage latch circuit 100 further includes an overcurrent protection module 15 .

[0040] The battery 400 is connected to the third switch module 14 via the overcurrent protection module 15 .

[0041] Specifically, the overcurrent protection module 15 is configured to disconnect the path between the battery 400 and the third switch module 14 when the battery current of the battery 400 is greater than or equal to a first current threshold.

[0042] The first current threshold is a specific current value used to determine whether the output current of the battery exceeds a safe range.

[0043] When the battery current is less than the first current threshold, the overcurrent protection module 15 keeps the path between the battery 400 and the third switch module 14 connected, and the circuit operates normally.

[0044] When the battery current is greater than or equal to the first current threshold, the overcurrent protection module 15 will disconnect the path between the battery 400 and the third switch module 14 to prevent excessive current from damaging subsequent circuits (including the load 500, etc.).

[0045] For example, the first current threshold can be determined based on factors such as the maximum current withstand of the load 500 and the rated current of each component in the circuit. It is typically set to a current value slightly lower than the current that could damage the circuit, allowing for timely implementation of protective measures before the current reaches a dangerous level. The first current threshold can be varied by changing the components in the circuit, their connections, and their parameters.

[0046] See also Figure 3 , Figure 3 1 is a structural block diagram of the latch module 11 provided in one embodiment of the present application.

[0047] In some embodiments, the latch module 11 includes a first voltage dividing unit 111 , a second voltage dividing unit 112 , and a comparison latch unit 113 .

[0048] Among them, the first voltage divider unit 111 is connected to the system power supply 300 and the inverting input end of the comparison latch unit 113 respectively, the second voltage divider unit 112 is connected to the working power supply 200 and the non-inverting input end of the comparison latch unit 113 respectively, and the output end of the comparison latch unit 113 is connected to the first switch module 12.

[0049] Specifically, the first voltage divider 111 is configured to divide the received system voltage to output a divided system voltage. The second voltage divider 112 is configured to divide the received operating voltage to output a divided operating voltage. The comparison latch 113 is configured to continuously output the first control signal upon receiving the divided system voltage and when the divided operating voltage is greater than or equal to a second voltage threshold and thereafter.

[0050] The system divided voltage is a voltage lower than the system voltage obtained after the first voltage dividing unit 111 divides the system voltage. The system divided voltage is a relatively low voltage value suitable for processing by the comparison latch unit 113 .

[0051] The operating divided voltage, similar to the system divided voltage, can be adjusted to a range suitable for processing by the comparison latch unit 113 through voltage division. For example, the operating voltage may be within a large range, and the divided operating divided voltage obtained after voltage division can be within the effective input range of the comparison latch unit 113 to perform accurate comparison and judgment.

[0052] The second voltage threshold is a specific voltage value used by the comparison latch unit 113 to determine the magnitude of the operating divided voltage. When the comparison latch unit 113 receives the system divided voltage and the operating divided voltage is greater than or equal to the second voltage threshold, the comparison latch unit 113 is triggered and continuously outputs the first control signal at this moment and thereafter. This threshold is typically determined based on the design requirements of the circuit and the operating characteristics of the load to ensure that the overvoltage protection mechanism is triggered when the operating voltage exceeds a certain safe range. The magnitude of the second voltage threshold can be changed by changing the components in the latch module 11, the connection relationship between the components, the parameters of the components, etc.

[0053] See also Figure 4 , Figure 4 1 is a schematic diagram of the circuit structure of the latch module 11 and the first switch module 12 provided in one embodiment of the present application.

[0054] In some embodiments, the first voltage dividing unit 111 includes a resistor R5 , a resistor R10 , and a capacitor C4 .

[0055] Among them, the first end of the resistor R5 is connected to the system power supply 300, the second end of the resistor R5 is respectively connected to the first end of the resistor R10, the first end of the capacitor C4, and the inverting input end of the comparison latch unit 113, and the second end of the resistor R10 and the second end of the capacitor C4 are both grounded.

[0056] In some embodiments, the second voltage dividing unit 112 includes a resistor R4 , a resistor R8 , a resistor R9 , and a capacitor C3 .

[0057] Among them, the first end of the resistor R4 is connected to the working power supply 200, the second end of the resistor R4 is respectively connected to the first end of the resistor R8, the first end of the resistor R9, the first end of the capacitor C3, and the non-inverting input end of the comparison latch unit 113, and the second end of the resistor R8, the second end of the resistor R9, and the second end of the capacitor C3 are all grounded.

[0058] In some embodiments, the comparison latch unit 113 includes a comparator U1A, a resistor R6, and a diode D1.

[0059] Among them, the first end of the resistor R6 is connected to the system power supply 300, the inverting input end of the comparator U1A is connected to the first voltage divider unit 111, the non-inverting input end of the comparator U1A is respectively connected to the cathode of the diode D1 and the second voltage divider unit 112, and the output end of the comparator U1A is respectively connected to the second end of the resistor R6, the anode of the diode D1, and the first switch module 12.

[0060] In some embodiments, the first switch module 12 includes a switch tube Q3 .

[0061] The control end of the switch tube Q3 is connected to the latch module 11 , the third end of the switch tube Q3 is connected to the second switch module 13 , and the second end of the switch tube Q3 is grounded.

[0062] In this embodiment, the switch transistor Q3 is an NMOS transistor, for example, the gate of the NMOS transistor is the control terminal of the switch transistor Q3, the source of the NMOS transistor is the second terminal of the switch transistor Q3, and the drain of the NMOS transistor is the third terminal of the switch transistor Q3.

[0063] In addition, the switch tube Q3 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0064] See also Figure 5 , Figure 5 It is a circuit structure diagram of the second switch module 13, the third switch module 14, and the overcurrent protection module 15 provided in one embodiment of the present application.

[0065] In some embodiments, the second switch module 13 includes: a switch tube Q2, a resistor R2, a resistor R7, and a capacitor C2.

[0066] Among them, the first end of the resistor R2 is connected to the battery 400, the control end of the switch tube Q2 is respectively connected to the second end of the resistor R2, the first end of the resistor R7, the first end of the capacitor C2, and the latch module 11, the third end of the switch tube Q2 is connected to the third switch module 14, and the second end of the switch tube Q2, the second end of the resistor R7, and the second end of the capacitor C2 are all grounded.

[0067] In this embodiment, the switch transistor Q2 is an NMOS transistor, for example, the gate of the NMOS transistor is the control terminal of the switch transistor Q2, the source of the NMOS transistor is the second terminal of the switch transistor Q2, and the drain of the NMOS transistor is the third terminal of the switch transistor Q2.

[0068] In addition, the switch tube Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0069] In some embodiments, the third switch module 14 includes: a switch tube Q1 , a resistor R1 , and a resistor R3 .

[0070] Among them, the second end of the resistor R3 is connected to the second switch module 13, the control end of the switch tube Q1 is respectively connected to the first end of the resistor R3 and the second end of the resistor R1, the first end of the switch tube Q1 is respectively connected to the first end of the resistor R1 and the battery 400, and the second end of the switch tube Q1 is connected to the load 500.

[0071] In this embodiment, the switch transistor Q1 is a PMOS transistor, for example, wherein the gate of the PMOS transistor is the control terminal of the switch transistor Q1 , the source of the PMOS transistor is the first terminal of the switch transistor Q1 , and the drain of the PMOS transistor is the second terminal of the switch transistor Q1 .

[0072] In addition, the switch tube Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon-controlled rectifier (SCR) device, a junction-gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0073] In some embodiments, the overcurrent protection module 15 includes a fuse F1 .

[0074] The battery 400 is connected to the third switch module 14 via a fuse F1 .

[0075] The following combination Figure 4 and Figure 5 The working principle of the overvoltage latch circuit 100 is briefly described.

[0076] After the system power supply 300 (e.g., +5V) is powered on, while the operating power supply 200 is not powered on, the operating voltage is 0 (VDC_OVP is 0V). At this point, current flows from the system power supply 300 (+5V) through resistor R6, diode D1, capacitor C3, and GND_BAT. The system power supply 300 (+5V) charges capacitor C3. If R6 = 10K and C3 = 100nF, it takes T (e.g., 1ms) for capacitor C3 to reach the same voltage as the inverting input terminal (pin 2) (e.g., 1.67V). During this period, the voltage at the non-inverting input (pin 3) of the comparator U1A is 0V, and the voltage at the inverting input is the working voltage (e.g. 1.67V) obtained by the resistor R10 after the system power supply 300 (+5V) passes through the resistor R5, the resistor R10, and GND_BAT. The output (pin 1) of the comparator U1A flips and outputs a low-level signal, so the current will not charge the capacitor C3, and the switch tube Q3 is not turned on. Therefore, if Figure 3As shown, the voltage of battery 400 flows from BAT+ through fuse F1, resistor R2, and resistor R7R7 to GND_BAT. At this time, the control terminal (pin 1) of switch Q2 is high, turning on switch Q2, thereby pulling resistor R3 low and turning on switch Q1. As a result, battery 400 can power load 500 through switch Q1.

[0077] After the system power supply 300 (e.g., +5V) is powered on, when the working power supply 200 is powered on, an operating voltage (e.g., 13.6V) is present at VDC_OVP. When the operating voltage rises to a certain voltage value (e.g., 16V) due to a fault and is greater than or equal to a first voltage threshold (e.g., 16V), the operating voltage of the working power supply 200 is divided by resistors R4 and R8, and the voltage across resistor R8 is the operating divided voltage (e.g., 1.75V) and greater than a second voltage threshold (e.g., 1.67V). At this time, comparator U1A does not flip, that is, the output terminal of comparator U1A outputs the first control signal (a high-level signal). This signal passes through diode D1 to the non-inverting input terminal (pin 3) of comparator U1A, thereby locking the voltage of the non-inverting input terminal (pin 3) of comparator U1A (e.g., 4.7V). At this time, the output terminal (pin 1) of comparator U1A continuously outputs the first control signal (a high-level signal, e.g., 5V). As a result, switch tube Q3 turns on, pulling down the voltage of resistor R2. At this time, the switch tube Q2 is not conducting, and the switch tube Q1 is also not conducting. Figure 3 As shown, the voltage at BAT+ is cut off and the voltage at V_BAT1 is 0V.

[0078] If, after the system power supply 300 (e.g., +5V) is powered on, the operating voltage of the working power supply 200 rises to a certain voltage value (e.g., 16V) due to a fault and is greater than or equal to a first voltage threshold (e.g., 16V), the battery 400 is unable to power the load 500. At this point, if the operating voltage drops below the first voltage threshold, even if the operating voltage is 0V, the voltage at the non-inverting input terminal (pin 3) of the comparator U1A is locked by the circuit connected to the system power supply (+5V), diode D1, resistor R8, and GND_BAT. Therefore, when the operating voltage of the working power supply (VDC_OVP) returns to normal voltage, the overvoltage latch circuit 100 does not recover, and the battery 400 is still unable to power the load 500. At this point, normal output will only resume if the system power supply 300 is restarted and the fault is resolved (the operating voltage of the working power supply 200 is less than the first voltage threshold), thereby reducing the possibility of load damage.

[0079] An embodiment of the present application provides an overvoltage latch circuit, which includes a latch module, a first switch module, a second switch module, and a third switch module. When the system power supply is normally supplied, the latch module receives the system voltage of the system power supply. At the same time, the latch module also continuously monitors the working voltage of the working power supply. Once the working voltage of the working power supply is greater than or equal to the first voltage threshold, the latch module will continue to output the first control signal at this moment and thereafter. The first switch module is turned on after receiving the first control signal output by the latch module, and outputs a first level signal. The second switch module is cut off when it receives the first level signal output by the first switch module. Since the second switch module is cut off, the third switch module is also cut off, thereby continuously disconnecting the battery from supplying power to the load, preventing overvoltage from damaging the load. The embodiment of the present application monitors the system voltage of the system power supply and the working voltage of the working power supply through the latch module, and can accurately determine whether the working voltage exceeds the first voltage threshold. When an operating voltage overvoltage is detected, the coordinated action of multiple switch modules can continuously disconnect the battery from supplying power to the load. The continuous latching function ensures that power will not be restored immediately even after the overvoltage state disappears briefly, avoiding intermittent shocks to the load caused by repeated overvoltage, and further protecting the load equipment.

[0080] An embodiment of the present application further provides an energy storage power supply, which includes the overvoltage latch circuit 100 as described above.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and there are many other changes in different aspects of the present invention as described above. For the sake of simplicity, they are not provided in detail. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An overvoltage latch circuit, characterized in that: include: Latch module, first switch module, second switch module, third switch module; The latch module is respectively connected to the first switch module, the system power supply, and the working power supply. The first switch module is also connected to the second switch module. The second switch module is connected to the third switch module. The third switch module is also respectively connected to the battery and the load. The latch module is configured to continuously output a first control signal when receiving the system voltage of the system power supply and when and after the working voltage of the working power supply is greater than or equal to a first voltage threshold; The first switch module is configured to be turned on and output a first level signal upon receiving the first control signal; The second switch module is configured to be turned off upon receiving the first level signal; The third switch module is configured to be turned off when the second switch module is turned off, so as to continuously disconnect the battery from supplying power to the load.

2. The overvoltage latch circuit according to claim 1, wherein: The latch module includes: a first voltage dividing unit, a second voltage dividing unit, and a comparison latch unit; The first voltage dividing unit is connected to the system power supply and the inverting input terminal of the comparison latch unit respectively, the second voltage dividing unit is connected to the working power supply and the non-inverting input terminal of the comparison latch unit respectively, and the output terminal of the comparison latch unit is connected to the first switch module; The first voltage dividing unit is used to divide the received system voltage to output a system divided voltage; The second voltage dividing unit is used to divide the received working voltage to output a working divided voltage; The comparison latch unit is configured to continuously output the first control signal upon receiving the system divided voltage and at a time when and after the working divided voltage is greater than or equal to a second voltage threshold.

3. The overvoltage latch circuit according to claim 2, wherein: The first voltage dividing unit includes: a resistor R5, a resistor R10, and a capacitor C4; A first end of the resistor R5 is connected to the system power supply, a second end of the resistor R5 is respectively connected to a first end of the resistor R10, a first end of the capacitor C4, and an inverting input end of the comparison latch unit, and a second end of the resistor R10 and a second end of the capacitor C4 are both grounded.

4. The overvoltage latch circuit according to claim 2, wherein: The second voltage dividing unit includes: a resistor R4, a resistor R8, a resistor R9, and a capacitor C3; The first end of the resistor R4 is connected to the working power supply, the second end of the resistor R4 is respectively connected to the first end of the resistor R8, the first end of the resistor R9, the first end of the capacitor C3, and the non-inverting input end of the comparison latch unit, and the second end of the resistor R8, the second end of the resistor R9, and the second end of the capacitor C3 are all grounded.

5. The overvoltage latch circuit according to claim 2, wherein: The comparison latch unit includes: a comparator U1A, a resistor R6, and a diode D1; The first end of the resistor R6 is connected to the system power supply, the inverting input end of the comparator U1A is connected to the first voltage divider unit, the non-inverting input end of the comparator U1A is respectively connected to the cathode of the diode D1 and the second voltage divider unit, and the output end of the comparator U1A is respectively connected to the second end of the resistor R6, the anode of the diode D1, and the first switch module.

6. The overvoltage latch circuit according to claim 1, wherein: The first switch module includes a switch tube Q3; The control end of the switch tube Q3 is connected to the latch module, the third end of the switch tube Q3 is connected to the second switch module, and the second end of the switch tube Q3 is grounded.

7. The overvoltage latch circuit according to claim 1, wherein: The second switch module includes: a switch tube Q2, a resistor R2, a resistor R7, and a capacitor C2; The first end of the resistor R2 is connected to the battery, the control end of the switch tube Q2 is respectively connected to the second end of the resistor R2, the first end of the resistor R7, the first end of the capacitor C2, and the latch module, the third end of the switch tube Q2 is connected to the third switch module, and the second end of the switch tube Q2, the second end of the resistor R7, and the second end of the capacitor C2 are all grounded.

8. The overvoltage latch circuit according to claim 1, wherein: The third switch module includes: a switch tube Q1, a resistor R1, and a resistor R3; The second end of the resistor R3 is connected to the second switch module, the control end of the switch tube Q1 is respectively connected to the first end of the resistor R3 and the second end of the resistor R1, the first end of the switch tube Q1 is respectively connected to the first end of the resistor R1 and the battery, and the second end of the switch tube Q1 is connected to the load.

9. The overvoltage latch circuit according to any one of claims 1 to 8, wherein: The overvoltage latch circuit also includes an overcurrent protection module; The battery is connected to the third switch module through the overcurrent protection module; The overcurrent protection module is configured to disconnect the path between the battery and the third switch module when the battery current of the battery is greater than or equal to a first current threshold.

10. An energy storage power supply, characterized in that: The invention comprises the overvoltage latch circuit according to any one of claims 1 to 9.

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