Boost power discharge overcurrent protection circuit and boost voltage device

Abstract

This invention discloses a Boost power supply overcurrent protection circuit and a Boost boost device. The Boost power supply overcurrent protection circuit includes a detection module and a control module. The first input terminal of the detection module is connected to the current sampling signal feedback terminal of the Boost power supply. The first input terminal of the control module is connected to the enable signal input terminal of the Boost power supply. The third input terminal of the control module is used to receive an enable control signal. The second input terminal of the control module is connected to the output terminal of the detection module. The output terminal of the control module is connected to the control terminal of the output switch of the Boost power supply. The first terminal of the output switch is connected to the output terminal of the Boost power supply. When the detection module detects an overcurrent or short circuit to ground at the current sampling signal feedback terminal, the output terminal of the detection module generates an output shutdown signal. Simultaneously, the control module controls the output switch to remain off for a preset time period based on the output shutdown signal, thereby preventing damage to the output switching devices in the Boost power supply output circuit.

Description

Technical Field

[0001] This invention relates to the field of Boost power supply technology, and in particular to a Boost power supply discharge overcurrent protection circuit and a Boost boost device. Background Technology

[0002] Boost power supplies are commonly used in drive circuits for inductive loads (such as fuel injectors or solenoid valves).

[0003] If it is necessary to rapidly increase the current of an inductive load to the target current value in a short period of time, a higher voltage needs to be applied to the inductive load. However, a high output voltage and a fast output current rise rate can easily cause output current overload or load short circuit, which in turn can cause the output switching devices on the Boost power supply output circuit to fail, affecting the reuse of the Boost power supply.

[0004] Therefore, it is necessary to monitor the output current of the Boost power supply to shut down its output in case of overload or short circuit, thereby preventing damage to the output switching devices in the Boost power supply output circuit. In existing technologies, the following methods are commonly used to detect the current value of the high-voltage output of a Boost power supply: 1) using a Hall current sensor to acquire the voltage; 2) connecting a sampling resistor in series in the Boost power supply output circuit and using a high-voltage operational amplifier or a high-voltage differential operational amplifier to output the current detection signal; 3) using a dedicated driver IC to acquire the voltage difference between the drain and source of the high-side MOSFET and calculate the current. However, these methods require dedicated integrated circuits or special components, resulting in high costs. Summary of the Invention

[0005] This invention provides a Boost power supply discharge overcurrent protection circuit and a Boost boost device to achieve discharge overcurrent protection of the Boost power supply at a low cost, thereby avoiding damage to the output switching devices in the Boost power supply output circuit.

[0006] According to one aspect of the present invention, a Boost power supply discharge overcurrent protection circuit is provided, comprising: a detection module and a control module;

[0007] The detection module includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, and an output terminal;

[0008] The first input terminal of the detection module is connected to the current sampling signal feedback terminal of the Boost power supply. The second, third, fourth, fifth, and sixth input terminals of the detection module are respectively connected to the first, second, third, fourth, and fifth power supplies. When the detection module detects a current overload or a short circuit to ground at the current sampling signal feedback terminal, the output terminal of the detection module generates an output shutdown signal.

[0009] The control module includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, and an output terminal;

[0010] The first input terminal of the control module is connected to the enable signal input terminal of the Boost power supply. The third input terminal of the control module is used to receive the enable control signal. The second input terminal of the control module is connected to the output terminal of the detection module. The fifth and sixth input terminals of the control module are respectively connected to the first power supply and the fourth power supply. The seventh input terminal of the control module is connected to the fifth power supply. The output terminal of the control module is connected to the control terminal of the output switch of the Boost power supply. The first terminal of the output switch is connected to the output terminal of the Boost power supply. The second terminal of the output switch serves as the load connection terminal of the Boost power supply. The fourth input terminal of the control module is connected to the second terminal of the output switch. The enable control signal is used to control the output switch to be turned on or off. The control module is used to control the output switch to remain off for a preset time period according to the output off signal.

[0011] Optionally, the detection module includes: an amplification and voltage offset unit, a delay unit, and a hysteresis comparison unit;

[0012] The amplification and voltage offset unit includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, and a first output terminal. The first input terminal of the amplification and voltage offset unit is connected to the first input terminal of the detection module, the second input terminal of the amplification and voltage offset unit is connected to the second input terminal of the detection module, the third input terminal of the amplification and voltage offset unit is connected to the third input terminal of the detection module, the fourth input terminal of the amplification and voltage offset unit is connected to the fourth input terminal of the detection module, and the fifth input terminal of the amplification and voltage offset unit is connected to the fifth power supply. The amplification and voltage offset unit is used to amplify and voltage offset the current received at the current sampling signal feedback terminal.

[0013] The delay unit includes a first input terminal, a second input terminal, and an output terminal; the first input terminal of the delay unit is connected to the first output terminal of the amplification and voltage offset unit, and the second input terminal of the delay unit is connected to the fifth power supply.

[0014] The hysteresis comparator includes a first input terminal, a second input terminal, a third input terminal, and an output terminal. The first input terminal of the hysteresis comparator is connected to the output terminal of the delay unit, the second input terminal of the hysteresis comparator is connected to the fifth input terminal of the detection module, the third input terminal of the hysteresis comparator is connected to the fifth power supply, and the output terminal of the hysteresis comparator is connected to the output terminal of the detection module. The hysteresis comparator is used to generate the output shutdown signal when the current at the feedback terminal of the current sampling signal after amplification and voltage offset is greater than or equal to a preset overcurrent voltage value. The delay unit is used to control the hysteresis comparator to continuously output the output shutdown signal within the preset time period.

[0015] Optionally, the amplification and voltage offset unit includes: a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor, and an operational amplifier;

[0016] The first end of the first resistor is connected to the first input terminal of the amplification and voltage offset unit, and the second end of the first resistor is connected to the first input terminal of the operational amplifier.

[0017] The first end of the second resistor is connected to the fifth power supply, and the second end of the second resistor is connected to the second input terminal of the operational amplifier;

[0018] The first end of the third resistor is connected to the second end of the second resistor, and the second end of the third resistor is connected to the fourth input end of the amplification and voltage offset unit.

[0019] The first terminal of the first capacitor is connected to the fifth power supply, and the second terminal of the first capacitor is connected to the second input terminal of the amplification and voltage offset unit.

[0020] The first power input terminal of the operational amplifier is connected to the second terminal of the first capacitor, the second power input terminal of the operational amplifier is connected to the third input terminal of the amplification and voltage offset unit, and the output terminal of the operational amplifier is connected to the first output terminal of the amplification and voltage offset unit.

[0021] The first end of the second capacitor is connected to the fifth power supply, and the second end of the second capacitor is connected to the second power supply input terminal of the operational amplifier.

[0022] Optionally, the delay unit includes: a first diode, a third capacitor, and a fifth resistor;

[0023] The first terminal of the first diode is connected to the first input terminal of the delay unit, the second terminal of the first diode is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the fifth power supply, the first terminal of the fifth resistor is connected to the first terminal of the third capacitor, the second terminal of the fifth resistor is connected to the second terminal of the third capacitor, and the first terminal of the fifth resistor is connected to the output terminal of the delay unit.

[0024] Optionally, the hysteresis comparison unit includes: a sixth resistor, a seventh resistor, an eighth resistor, and a comparator;

[0025] The first end of the sixth resistor is connected to the first input terminal of the comparator, and the second end of the sixth resistor is connected to the fifth power supply.

[0026] The first end of the seventh resistor is connected to the first input terminal of the comparator, and the second end of the seventh resistor is connected to the second input terminal of the hysteresis comparator unit;

[0027] The second input terminal of the comparator is connected to the first input terminal of the hysteresis comparator unit, the first power input terminal of the comparator is connected to the second terminal of the seventh resistor, the second power input terminal of the comparator is connected to the second terminal of the sixth resistor, the output terminal of the comparator is connected to the first terminal of the eighth resistor, the second terminal of the eighth resistor is connected to the first terminal of the seventh resistor, and the output terminal of the comparator is connected to the output terminal of the hysteresis comparator unit.

[0028] Optionally, the control module includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor, a second diode, a third diode, and a control unit;

[0029] The first power supply pin of the control unit is connected to the fifth input terminal of the control module, the first enable pin of the control unit is connected to the first input terminal of the control module, the second power supply pin of the control unit is connected to the fifth power supply, the second enable pin of the control unit is connected to the third input terminal of the control module through the ninth resistor, and the second input terminal of the control module is connected to the second enable pin of the control unit; the first end of the tenth resistor is connected to the first enable pin of the control unit, and the second end of the tenth resistor is connected to the fourth power supply.

[0030] The first end of the fourth capacitor is connected to the second power supply pin of the control unit, and the second end of the fourth capacitor is connected to the fifth input terminal of the control module.

[0031] The first terminal of the second diode is connected to the second terminal of the fourth capacitor, and the second terminal of the second diode is connected to the first pin of the control unit;

[0032] The first terminal of the fifth capacitor is connected to the second terminal of the second diode, the second terminal of the fifth capacitor is connected to the first terminal of the third diode, and the second terminal of the third diode is connected to the fifth power supply.

[0033] The first end of the eleventh resistor is connected to the second pin of the control unit, and the second end of the eleventh resistor is connected to the output terminal of the control module.

[0034] The third pin of the control unit is connected to the first terminal of the third diode, the first terminal of the twelfth resistor is connected to the first terminal of the third diode, the first terminal of the twelfth resistor is connected to the fourth input terminal of the control module, and the second terminal of the twelfth resistor is connected to the fifth power supply.

[0035] Optionally, the length of the preset time period is positively correlated with the length of the discharge time of the third capacitor.

[0036] Optionally, the amplification and voltage offset unit further includes a second output terminal, and the amplification and voltage offset unit further includes a fourth resistor;

[0037] The first end of the fourth resistor is connected to the second end of the first resistor, the second end of the fourth resistor is connected to the second output end of the amplification and voltage offset unit, and the second output end of the amplification and voltage offset unit is connected to an external sampling circuit.

[0038] Optionally, the voltage of the first power supply is greater than the voltage of any one of the second power supply, the third power supply, the fourth power supply, and the fifth power supply; wherein the voltage of the first power supply is 12V.

[0039] According to another aspect of the present invention, a Boost boost device is provided, optionally including a Boost power supply and the Boost power supply discharge overcurrent protection circuit described in the previous aspect; wherein, the Boost power supply includes a main control chip, a first output capacitor, a second output capacitor, an isolation diode, a boost inductor, a switching transistor, an output switch, a current sampling resistor, a first voltage sampling resistor, and a second voltage sampling resistor;

[0040] The first pin of the main control chip is connected to the enable signal input terminal of the Boost power supply, the second pin of the main control chip is connected to the control terminal of the switching transistor, the third pin of the main control chip is connected to the first terminal of the current sampling resistor, and the fourth pin of the main control chip is connected to the first terminal of the second voltage sampling resistor.

[0041] The first terminal of the switching transistor is connected to the first terminal of the first output capacitor through the boost inductor. The first terminal of the first output capacitor is connected to the battery. The second terminal of the first output capacitor is connected to the fifth power supply. The second terminal of the switching transistor is connected to the fifth power supply through the current sampling resistor. The first terminal of the current sampling resistor serves as the current sampling signal feedback terminal of the Boost power supply.

[0042] The first terminal of the isolation diode is connected to the first terminal of the switching transistor, the second terminal of the isolation diode is connected to the first terminal of the second output capacitor, and the second terminal of the second output capacitor is connected to the second terminal of the switching transistor.

[0043] The first end of the first voltage sampling resistor is connected to the output terminal of the Boost power supply, the second end of the first voltage sampling resistor is connected to the second terminal of the isolation diode, the first end of the second voltage sampling resistor is connected to the second end of the first voltage sampling resistor, and the second end of the second voltage sampling resistor is connected to the fifth power supply.

[0044] The technical solution of this invention, through the setting of a detection module and a control module, connects the first input terminal of the detection module to the current sampling signal feedback terminal of the Boost power supply; the first input terminal of the control module is connected to the enable signal input terminal of the Boost power supply; the third input terminal of the control module is used to receive the enable control signal; the second input terminal of the control module is connected to the output terminal of the detection module; the output terminal of the control module is connected to the control terminal of the output switch of the Boost power supply; the fourth input terminal of the control module is connected to the second terminal of the output switch; the first terminal of the output switch is connected to the output terminal of the Boost power supply; and the second terminal of the output switch serves as the load connection terminal of the Boost power supply. The enable control signal is used to control the conduction or deactivation of the output switch. When the detection module detects a current overload or short circuit to ground at the current sampling signal feedback terminal, the output terminal of the detection module generates an output deactivation signal. Simultaneously, the control module controls the output switch to remain deactivated for a preset time period based on the output deactivation signal, thereby achieving overcurrent protection for the Boost power supply and preventing damage to the output switching devices in the Boost power supply output circuit. The power supply required for both the detection module and the control module can be 12V or lower. The Boost power supply discharge overcurrent protection circuit does not require the use of dedicated integrated circuits or special components. Thus, the technical solution of this embodiment of the invention achieves discharge overcurrent protection of the Boost power supply at a low cost, avoiding damage to the output switching devices on the Boost power supply output circuit.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of a Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention;

[0048] Figure 2 This is a schematic diagram of a Boost power supply provided in an embodiment of the present invention;

[0049] Figure 3 This is a schematic diagram of another Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention;

[0050] Figure 4 This is a schematic diagram of the amplification and voltage offset unit provided in an embodiment of the present invention;

[0051] Figure 5 This is a schematic diagram of the structure of a delay unit and a hysteresis comparison unit provided in an embodiment of the present invention;

[0052] Figure 6 This is a schematic diagram of another Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention. Detailed Implementation

[0053] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0054] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0055] Figure 1 This is a schematic diagram of a Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention. (Reference) Figure 1 The Boost power supply discharge overcurrent protection circuit includes: a detection module 210 and a control module 220;

[0056] The detection module 210 includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, and an output terminal. The sixth input terminal may include multiple sub-input terminals, each of which is connected to a fifth power supply.

[0057] The first input terminal of the detection module 210 is connected to the current sampling signal feedback terminal (BST.C) of the Boost power supply. The second, third, fourth, fifth, and sixth input terminals of the detection module 210 are connected to the first, second, third, fourth, and fifth power supplies, respectively. When the detection module 210 detects a current overload or short circuit to ground at the current sampling signal feedback terminal, the output terminal of the detection module 210 generates an output shutdown signal.

[0058] The control module 220 includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, a sixth input terminal, a seventh input terminal, and an output terminal;

[0059] The first input terminal of the control module 220 is connected to the enable signal input terminal of the Boost power supply. The third input terminal of the control module 220 is used to receive the enable control signal. The second input terminal of the control module 220 is connected to the output terminal of the detection module 210. The fifth and sixth input terminals of the control module 220 are respectively connected to the first power supply and the fourth power supply. The seventh input terminal of the control module 220 is connected to the fifth power supply. The output terminal of the control module 220 is connected to the control terminal of the output switch 120 of the Boost power supply. The first terminal of the output switch 120 is connected to the output terminal A of the Boost power supply. The second terminal of the output switch 120 serves as the load connection terminal B of the Boost power supply. The fourth input terminal of the control module 220 is connected to the second terminal of the output switch 120. The enable control signal is used to control the output switch 120 to be turned on or off. The control module 220 is used to control the output switch 120 to remain off for a preset time period according to the output off signal.

[0060] In this embodiment of the invention, the first power supply, the second power supply, the third power supply, the fourth power supply, and the fifth power supply are all power supplies with a voltage of 12V or less. For example, the first power supply is +12V, the second power supply is -12V, the third power supply has a Vref voltage, the fourth power supply is 5V, and the fifth power supply is connected to ground (GND).

[0061] For example, refer to Figure 2 , Figure 2 This is a schematic diagram of a Boost power supply provided in an embodiment of the present invention. The Boost power supply includes: a main control chip 110 (i.e., Boost control IC), a first output capacitor C11, a second output capacitor C12 (i.e., power capacitor), an isolation diode D11, a boost inductor L11, a switching transistor M11, an output switch 120, a current sampling resistor R11, a first voltage sampling resistor R12, and a second voltage sampling resistor R13.

[0062] The first pin of the main control chip 110 is connected to the enable signal input terminal of the Boost power supply, the second pin of the main control chip 110 is connected to the control terminal (e.g., gate) of the switching transistor M11, the third pin of the main control chip 110 is connected to the first terminal of the current sampling resistor R11, and the fourth pin of the main control chip 110 is connected to the first terminal of the second voltage sampling resistor R13.

[0063] The first terminal of the switching transistor M11 is connected to the first terminal of the first output capacitor C11 through the boost inductor L11. The first terminal of the first output capacitor C11 is connected to the battery (battery voltage Vbatt). The second terminal of the first output capacitor C11 is connected to the fifth power supply. The second terminal of the switching transistor M11 is connected to the fifth power supply through the current sampling resistor R11. The first terminal of the current sampling resistor R11 serves as the current sampling signal feedback terminal (BST.C) of the Boost power supply.

[0064] The first terminal (e.g., anode) of the isolation diode D11 is connected to the first terminal of the switching transistor M11, the second terminal (e.g., cathode) of the isolation diode D11 is connected to the first terminal of the second output capacitor C12, and the second terminal of the second output capacitor C12 is connected to the second terminal of the switching transistor M11.

[0065] The first terminal of the first voltage sampling resistor R12 is connected to the output terminal A of the Boost power supply, the second terminal of the first voltage sampling resistor R12 is connected to the second terminal of the isolation diode D11, the first terminal of the second voltage sampling resistor R13 is connected to the second terminal of the first voltage sampling resistor R12, and the second terminal of the second voltage sampling resistor R13 is connected to the fifth power supply; the first terminal of the output switch 120 is connected to the output terminal of the Boost power supply, the second terminal of the output switch 120 serves as the load connection terminal of the Boost power supply, and the load connection terminal B of the Boost power supply is used to connect the load. The output switch 120 can be composed of a field-effect transistor MOSFET.

[0066] For example, the working principle of the Boost power supply includes: the main control chip 110 receives the enable signal Boost_Enable through the enable signal input terminal. When the enable signal Boost_Enable is high, the enable is effective. The main control chip 110 controls the switching transistor M11 to turn on, and the battery charges the second output capacitor C12, that is, the Boost power supply is charged. Since the direction of the discharge current of the Boost power supply is opposite to the direction of the charging current, when the Boost power supply is discharging, the switching transistor M11 is turned off, the output switch 120 is turned on, and the second output capacitor C12 supplies power to the load through the output switch 120.

[0067] In this embodiment of the invention, the power supply required by the detection module 210 is less than or equal to 12V. Therefore, the detection module 210 can be composed of multiple conventional circuit components connected to each other, thus reducing the cost of the detection module 210. The first input terminal of the detection module 210 receives the current signal from the current sampling signal feedback terminal of the Boost power supply to monitor, judge, and process the output current of the Boost power supply. When the detection module 210 detects a current overload or a short circuit to ground at the current sampling signal feedback terminal, the detection module 210 generates an output shutdown signal and outputs it from the output terminal of the detection module 210.

[0068] The enable signal Boost_Enable received by the enable signal input terminal of the Boost power supply is simultaneously input to the first input terminal of the control module 220. Upon receiving the high-level enable signal Boost_Enable, the control module 220 enters the working state. If it does not receive the high-level enable signal Boost_Enable, it remains inactive. Once in the working state, if the control module 220 receives the high-level enable control signal Boost_Output_Enable, it controls the output switch 120 of the Boost power supply to turn on, and the Boost power supply outputs current to the load. If the control module 220 receives the low-level enable control signal Boost_Output_Enable or does not receive the enable control signal Boost_Output_Enable, the output switch 120 remains off, and the Boost power supply does not output current to the load. The control module 220 requires a power supply of less than or equal to 12V; therefore, it can be constructed from multiple conventional circuit components interconnected, resulting in a low cost.

[0069] In summary, during the process of the Boost power supply supplying power to the load while the output switch 120 of the Boost power supply is turned on, the detection module 210 monitors and judges the current at the current sampling signal feedback terminal of the Boost power supply. When the detection module 210 detects an overload or short circuit to ground at the current sampling signal feedback terminal, it generates an output shutdown signal and outputs it from its output terminal to the second input terminal of the control module 220. The control module 220 then directly controls the output switch 120 to shut down based on the output shutdown signal, and maintains the shutdown for a preset time. During the process of the output switch 120 remaining off, neither the high nor low level enable control signal Boost_Output_Enable can control the output switch 120 to turn on or off; that is, the output switch 120 is forcibly maintained off for the preset time. Therefore, when the output current of the Boost power supply is overloaded or short-circuited to ground, not only is the output switch 120 on the Boost power supply output circuit turned off, avoiding damage to the output switch 120 and realizing the discharge overcurrent protection of the Boost power supply, but also the output switch 120 cannot be controlled even if the enable control signal Boost_Output_Enable is effective within a preset time, ensuring sufficient turn-off time for the output switch 120. This prevents the output switch 120 from being turned on again while the control signal Boost_Output_Enable is still effective, thus avoiding the situation where the output switch 120 is frequently turned off and on in a short period of time, causing the output switch 120 to eventually suffer switching losses and be damaged.

[0070] The technical solution of this invention, based on the current sampling resistor R11 and current sampling signal feedback terminal inherent in the Boost power supply, sets up a low-cost detection module 210 and control module 220. When the output current of the Boost power supply is overloaded or short-circuited to ground, it not only turns off the output switch 120 on the Boost power supply output circuit, avoiding damage to the output switch 120 device and realizing the discharge overcurrent protection of the Boost power supply, but also ensures that the output switch 120 is forcibly kept off for a preset time. Even if the enable control signal Boost_Output_Enable is effective within this preset time, it cannot control the output switch 120. This ensures that the output switch 120 has sufficient off time and avoids the situation where the output switch 120 is turned on again while the enable control signal Boost_Output_Enable is still effective within the preset time period, and then the output off signal controls the output switch 120 to turn off again. This prevents the output switch 120 from being frequently turned on and off in a short period of time, which would eventually cause the output switch 120 to be damaged due to switching losses. The specific value of the preset time can be set according to actual needs. This embodiment does not impose a specific limitation on it. For example, it can be set according to the holding time of the high and low levels of the enable control signal Boost_Output_Enable.

[0071] In this embodiment of the invention, the specific circuit structures of the detection module and the control module can be various. The following are exemplary descriptions, but they are not intended to limit the invention.

[0072] Figure 3 This is a schematic diagram of another Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention. (Reference) Figure 3 Based on the above technical solution, as an embodiment of the present invention, the detection module 210 may optionally include: an amplification and voltage offset unit 211, a delay unit 212, and a hysteresis comparison unit 213.

[0073] The amplification and voltage offset unit 211 includes a first input terminal, a second input terminal, a third input terminal, a fourth input terminal, a fifth input terminal, and a first output terminal. The first input terminal of the amplification and voltage offset unit 211 is connected to the first input terminal of the detection module 210, the second input terminal of the amplification and voltage offset unit 211 is connected to the second input terminal of the detection module 210, the third input terminal of the amplification and voltage offset unit 211 is connected to the third input terminal of the detection module 210, the fourth input terminal of the amplification and voltage offset unit 211 is connected to the fourth input terminal of the detection module 210, and the fifth input terminal of the amplification and voltage offset unit 211 is connected to a fifth power supply. The amplification and voltage offset unit 211 is used to amplify and voltage offset the current at the feedback terminal of the received current sampling signal.

[0074] The delay unit 212 includes a first input terminal, a second input terminal, and an output terminal; the first input terminal of the delay unit 212 is connected to the first output terminal of the amplification and voltage offset unit 211, and the second input terminal of the delay unit 212 is connected to a fifth power supply.

[0075] The hysteresis comparison unit 213 includes a first input terminal, a second input terminal, a third input terminal, and an output terminal; the first input terminal of the hysteresis comparison unit 213 is connected to the output terminal of the delay unit 212, the second input terminal of the hysteresis comparison unit 213 is connected to the fifth input terminal of the detection module 210, the third input terminal of the hysteresis comparison unit 213 is connected to the fifth power supply, and the output terminal of the hysteresis comparison unit 213 is connected to the output terminal of the detection module 210.

[0076] The hysteresis comparator 213 generates an output shutdown signal when the current at the feedback terminal of the current sampling signal after amplification and voltage offset is greater than or equal to a preset overcurrent voltage value. The delay unit 212 controls the hysteresis comparator 213 to continuously output the shutdown signal within a preset time period. The preset overcurrent voltage value can be set according to actual conditions. When the current at the feedback terminal of the current sampling signal after amplification and voltage offset is greater than or equal to the preset overcurrent voltage value, it means that the output current of the Boost power supply is overloaded or short-circuited to ground, and the hysteresis comparator 213 generates the output shutdown signal.

[0077] In this embodiment of the invention, the specific structures of the detection module, control module, amplification and voltage offset unit, delay unit, and hysteresis comparison unit can be varied, and each can be constructed by connecting multiple conventional components in the art. This embodiment does not specifically limit these components, but will provide an exemplary description below, which is not intended to limit the invention.

[0078] Figure 4 This is a schematic diagram of the amplification and voltage offset unit provided in an embodiment of the present invention. (Reference) Figure 4 Based on the above technical solution, as an embodiment of the present invention, optionally, the amplification and voltage offset unit 211 includes: a first resistor R1 (e.g., 2kΩ), a second resistor R2 (e.g., 2kΩ), a third resistor R3 (e.g., 10kΩ), a first capacitor C1, a second capacitor C2, and an operational amplifier K1, the operational amplifier K1 being, for example, an LM358.

[0079] The first end of the first resistor R1 is connected to the first input terminal of the amplification and voltage offset unit 211, and the second end of the first resistor R1 is connected to the first input terminal of the operational amplifier K1 (for example, the "-" input terminal of the operational amplifier K1).

[0080] The first end of the second resistor R2 is connected to the fifth power supply, and the second end of the second resistor R2 is connected to the second input terminal of the operational amplifier K1 (for example, the "+" input terminal of the operational amplifier K1).

[0081] The first end of the third resistor R3 is connected to the second end of the second resistor R2, and the second end of the third resistor R3 is connected to the fourth input end of the amplification and voltage offset unit 211.

[0082] The first terminal of the first capacitor C1 is connected to the fifth power supply, and the second terminal of the first capacitor C1 is connected to the second input terminal of the amplification and voltage offset unit 211.

[0083] The first power input terminal of the operational amplifier K1 (e.g., the "+" power input terminal of the operational amplifier K1) is connected to the second terminal of the first capacitor C1, the second power input terminal of the operational amplifier K1 (e.g., the "-" power input terminal of the operational amplifier K1) is connected to the third input terminal of the amplification and voltage offset unit 211, and the output terminal of the operational amplifier K1 is connected to the first output terminal of the amplification and voltage offset unit 211.

[0084] The first terminal of the second capacitor C2 is connected to the fifth power supply, and the second terminal of the second capacitor C2 is connected to the second power supply input terminal of the operational amplifier K1.

[0085] Continue to refer to Figure 4 Based on the above technical solution, as an embodiment of the present invention, optionally, the amplification and voltage offset unit 211 further includes a second output terminal, and the amplification and voltage offset unit 211 further includes a fourth resistor R4 (e.g., 10kΩ); the first end of the fourth resistor R4 is connected to the second end of the first resistor R1, the second end of the fourth resistor R4 is connected to the second output terminal of the amplification and voltage offset unit 211, and the second output terminal of the amplification and voltage offset unit 211 is connected to an external sampling circuit, so that the external sampling circuit can collect the current at the current sampling signal feedback terminal after amplification and voltage offset, so as to facilitate the external circuit to analyze the output current of the Boost power supply.

[0086] Figure 5 This is a schematic diagram of the structure of a delay unit and a hysteresis comparison unit provided in an embodiment of the present invention. (Reference) Figure 5 Based on the above technical solution, as an embodiment of the present invention, the delay unit 212 may optionally include: a first diode D1, a third capacitor C3 and a fifth resistor R5;

[0087] The first terminal (e.g., anode) of the first diode D1 is connected to the first input terminal of the delay unit 212, and the second terminal (e.g., cathode) of the first diode D1 is connected to the first terminal of the third capacitor C3.

[0088] The second terminal of the third capacitor C3 is connected to the fifth power supply. The first terminal of the fifth resistor R5 is connected to the first terminal of the third capacitor C3, the second terminal of the fifth resistor R5 is connected to the second terminal of the third capacitor C3, and the first terminal of the fifth resistor R5 is connected to the output terminal of the delay unit 212. The current at the feedback terminal of the amplified and voltage-shifted current sampling signal charges the third capacitor C3 through the first diode D1.

[0089] Optionally, the length of the preset time period is positively correlated with the length of the discharge time of the third capacitor C3; the longer the discharge time of the third capacitor C3, the longer the preset time period, and vice versa. The length of the discharge time of the third capacitor C3 can determine the length of the preset time period; for example, the preset time period is the discharge duration of the third capacitor C3. For example, the size of the third capacitor C3 can be tens of nanofarads.

[0090] Continue to refer to Figure 5 Based on the above technical solution, as an embodiment of the present invention, optionally, the hysteresis comparison unit 213 includes: a sixth resistor R6, a seventh resistor R7, an eighth resistor R8 and a comparator K2, the comparator K2 being, for example, an LM2901.

[0091] The first end of the sixth resistor R6 is connected to the first input terminal of comparator K2 (for example, the "+" input terminal of comparator K2), and the second end of the sixth resistor R6 is connected to the fifth power supply.

[0092] The first end of the seventh resistor R7 is connected to the first input terminal of comparator K2, and the second end of the seventh resistor R7 is connected to the second input terminal of hysteresis comparator unit 213.

[0093] The second input terminal of comparator K2 (e.g., the "-" input terminal of comparator K1) is connected to the first input terminal of hysteresis comparator unit 213. The first power input terminal of comparator K2 (e.g., the "+" power input terminal of comparator K2) is connected to the second terminal of the seventh resistor R7. The second power input terminal of comparator K2 (e.g., the "-" power input terminal of comparator K2) is connected to the second terminal of the sixth resistor R6. The output terminal of comparator K2 is connected to the first terminal of the eighth resistor R8. The second terminal of the eighth resistor R8 is connected to the first terminal of the seventh resistor R7. The output terminal of comparator K2 is connected to the output terminal of hysteresis comparator unit 213.

[0094] Figure 6 This is a schematic diagram of another Boost power supply discharge overcurrent protection circuit provided in an embodiment of the present invention. (Reference) Figure 6Based on the above technical solution, as an embodiment of the present invention, the control module 220 optionally includes: a ninth resistor R9 (e.g., 5.1kΩ), a tenth resistor R10 (e.g., 5.1kΩ), an eleventh resistor R11, a twelfth resistor R12, a fourth capacitor C4, a fifth capacitor C5, a second diode D2, a third diode D3, and a control unit 221, which is, for example, a control chip of model FAN7085;

[0095] The first power supply pin VCC of the control unit 221 is connected to the fifth input terminal of the control module 220. The first enable pin IN of the control unit 221 is connected to the first input terminal of the control module 220. The second power supply pin of the control unit 221 is connected to the fifth power supply. The second enable pin RESET of the control unit 221 is connected to the third input terminal of the control module 220 through the ninth resistor R9. The second input terminal of the control module 220 is connected to the second enable pin of the control unit 221. The first end of the tenth resistor R10 is connected to the first enable pin of the control unit 221, and the second end of the tenth resistor R10 is connected to the fourth power supply.

[0096] The first end of the fourth capacitor C4 is connected to the second power supply pin of the control unit 221, and the second end of the fourth capacitor C4 is connected to the fifth input terminal of the control module 220.

[0097] The first terminal (e.g., anode) of the second diode D2 is connected to the second terminal of the fourth capacitor C4, and the second terminal (e.g., cathode) of the second diode D2 is connected to the first pin VB of the control unit 221.

[0098] The first terminal of the fifth capacitor C5 is connected to the second terminal of the second diode D2, the second terminal of the fifth capacitor C5 is connected to the first terminal (e.g., cathode) of the third diode D3, and the second terminal (e.g., anode) of the third diode is connected to the fifth power supply.

[0099] The first end of the eleventh resistor R11 is connected to the second pin HO of the control unit 221, and the second end of the eleventh resistor R11 is connected to the output terminal of the control module 220.

[0100] The third pin VS of the control unit 221 is connected to the first terminal of the third diode D3, the first terminal of the twelfth resistor R12 is connected to the first terminal of the third diode D3, the first terminal of the twelfth resistor R12 is connected to the fourth input terminal of the control module 220, and the second terminal of the twelfth resistor R12 is connected to the fifth power supply.

[0101] The following is combined Figure 6 and Figure 2 The working principle of the Boost power supply discharge overcurrent protection circuit provided in the embodiments of the present invention will be explained as follows:

[0102] The amplification and voltage offset unit 211 amplifies and voltage offsets the current at the feedback terminal of the received current sampling signal and then inputs it to the delay unit 212. In the delay unit 212, the current at the feedback terminal of the amplified and voltage offset current sampling signal charges the third capacitor C3 through the first diode D1. The sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 form a voltage divider network. When the voltage of the current signal exceeds the voltage at the "+" input terminal of comparator K2 (i.e., when the current at the feedback terminal of the current sampling signal after amplification and voltage offset is greater than or equal to the preset overcurrent voltage value), the output of comparator K2 flips, and the hysteresis comparator unit 213 generates an output shutdown signal. The output shutdown signal forcibly pulls down the second enable pin of the control unit 221. The second enable pin is no longer controlled by the enable control signal Boost_Output_Enable, thereby turning off the output switch 120 and stopping the output at the load connection terminal of the Boost power supply. In this way, when the output current of the Boost power supply is overloaded or short-circuited to ground, the output switch 120 on the output circuit of the Boost power supply is turned off, avoiding damage to the output switch 120 device and realizing the discharge overcurrent protection of the Boost power supply.

[0103] Simultaneously, the output voltage of the amplification and voltage offset unit 211 decreases rapidly, the first diode D1 is cut off, and the third capacitor C3 slowly discharges through the fifth resistor R5. The preset time period during which the output switch 120 remains off is approximately equal to the discharge time of the third capacitor C3, until the voltage drops below the voltage at the "+" input terminal of the hysteresis comparator K2. The comparator K2 flips again, and the second enable pin of the control unit 221 continues to be controlled by Boost_Output_Enable, meaning that the output switch 120 continues to be controlled by the enable control signal Boost_Output_Enable.

[0104] The main functions of the delay unit 212 and the hysteresis comparator unit 213 are: after triggering comparator K2 to turn off output switch 120, to ensure that output switch 120 has a sufficiently long off time, so as to avoid the situation where, when the enable control signal Boost_Output_Enable is still effective within the preset time period, the current signal voltage drops rapidly and output switch 120 is turned on again, and after output switch 120 is turned on, comparator K2 is triggered to flip and turn off output switch 120 again in a short time, which would cause output switch 120 to switch rapidly and continuously, thereby generating switching noise and MOSFET switching losses, affecting the operation of other circuit units and ultimately causing damage to output switch 120.

[0105] This invention also provides a Boost converter, which includes a Boost power supply and a Boost power supply discharge overcurrent protection circuit for any of the above-described technical solutions. The Boost converter and the Boost power supply discharge overcurrent protection circuit provided in this invention belong to the same inventive concept and can achieve the same technical effect; therefore, repeated details are omitted here.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A boost power supply discharge overcurrent protection circuit, characterized by, The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection and protection circuit for a boost power supply. The application relates to a current overload detection The hysteresis comparison unit comprises a first input end, a second input end, a third input end and an output end; the first input end of the hysteresis comparison unit is connected with the output end of the delay unit, the second input end of the hysteresis comparison unit is connected with the fifth input end of the detection module, the third input end of the hysteresis comparison unit is connected with the fifth power supply, and the output end of the hysteresis comparison unit is connected with the output end of the detection module; the hysteresis comparison unit is used for generating the output shutdown signal when the current of the current sampling signal feedback end after amplification and voltage offset is greater than or equal to a preset overcurrent voltage value; and the delay unit is used for controlling the hysteresis comparison unit to continuously output the output shutdown signal within the preset time period.

2. The boost power supply discharge overcurrent protection circuit of claim 1, wherein, The amplification and voltage offset unit comprises a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and an operational amplifier. The first end of the first resistor is connected with the first input end of the amplification and voltage offset unit, and the second end of the first resistor is connected with the first input end of the operational amplifier; the first end of the second resistor is connected with the fifth power supply, and the second end of the second resistor is connected with the second input end of the operational amplifier; the first end of the third resistor is connected with the second end of the second resistor, and the second end of the third resistor is connected with the fourth input end of the amplification and voltage offset unit; The first end of the first capacitor is connected with the fifth power supply, and the second end of the first capacitor is connected with the second input end of the amplification and voltage offset unit; The first power supply input end of the operational amplifier is connected with the second end of the first capacitor, the second power supply input end of the operational amplifier is connected with the third input end of the amplification and voltage offset unit, and the output end of the operational amplifier is connected with the first output end of the amplification and voltage offset unit; The first end of the second capacitor is connected with the fifth power supply, and the second end of the second capacitor is connected with the second power supply input end of the operational amplifier.

3. The boost power supply discharge overcurrent protection circuit of claim 1, wherein, The delay unit comprises a first diode, a third capacitor and a fifth resistor. The first pole of the first diode is connected with the first input end of the delay unit, the second pole of the first diode is connected with the first end of the third capacitor, the second end of the third capacitor is connected with the fifth power supply, the first end of the fifth resistor is connected with the first end of the third capacitor, the second end of the fifth resistor is connected with the second end of the third capacitor, and the first end of the fifth resistor is connected with the output end of the delay unit.

4. The boost power supply discharge overcurrent protection circuit of claim 1, wherein, The hysteresis comparison unit comprises a sixth resistor, a seventh resistor, an eighth resistor and a comparator. The first end of the sixth resistor is connected with the first input end of the comparator, and the second end of the sixth resistor is connected with the fifth power supply; The first end of the seventh resistor is connected with the first input end of the comparator, and the second end of the seventh resistor is connected with the second input end of the hysteresis comparison unit; The second input end of the comparator is connected with the first input end of the hysteresis comparison unit, the first power input end of the comparator is connected with the second end of the seventh resistor, the second power input end of the comparator is connected with the second end of the sixth resistor, the output end of the comparator is connected with the first end of the eighth resistor, the second end of the eighth resistor is connected with the first end of the seventh resistor, and the output end of the comparator is connected with the output end of the hysteresis comparison unit.

5. The Boost power supply discharge overcurrent protection circuit of claim 1, wherein, The control module comprises a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a fourth capacitor, a fifth capacitor, a second diode, a third diode and a control unit. The first power pin of the control unit is connected with the fifth input end of the control module, the first enable pin of the control unit is connected with the first input end of the control module, the second power pin of the control unit is connected with the fifth power supply, the second enable pin of the control unit is connected with the third input end of the control module through the ninth resistor, and the second input end of the control module is connected with the second enable pin of the control unit. The first end of the tenth resistor is connected with the first enable pin of the control unit, and the second end of the tenth resistor is connected with the fourth power supply. The first end of the fourth capacitor is connected with the second power pin of the control unit, and the second end of the fourth capacitor is connected with the fifth input end of the control module. The first pole of the second diode is connected with the second end of the fourth capacitor, and the second pole of the second diode is connected with the first pin of the control unit. The first end of the fifth capacitor is connected with the second pole of the second diode, the second end of the fifth capacitor is connected with the first pole of the third diode, and the second pole of the third diode is connected with the fifth power supply. The first end of the eleventh resistor is connected with the second pin of the control unit, and the second end of the eleventh resistor is connected with the output end of the control module.

6. The Boost power supply discharge overcurrent protection circuit of claim 3, wherein, The third pin of the control unit is connected with the first pole of the third diode, the first end of the twelfth resistor is connected with the first pole of the third diode, the first end of the twelfth resistor is connected with the fourth input end of the control module, and the second end of the twelfth resistor is connected with the fifth power supply.

7. The boost power supply discharge overcurrent protection circuit of claim 2, wherein, The length of the preset time period is positively correlated with the length of the third capacitor discharge time. The amplification and voltage offset unit further comprises a second output end, and the amplification and voltage offset unit further comprises a fourth resistor.

8. The Boost power supply discharge overcurrent protection circuit of claim 1, wherein, The first end of the fourth resistor is connected with the second end of the first resistor, the second end of the fourth resistor is connected with the second output end of the amplification and voltage offset unit, and the second output end of the amplification and voltage offset unit is connected with an external sampling circuit. The voltage of the first power supply is greater than the voltage of any one of the second power supply, the third power supply, the fourth power supply and the fifth power supply; wherein the voltage of the first power supply is 12V.

9. A boost device, characterized by The Boost power supply and the discharge overcurrent protection circuit of the Boost power supply in any one of claims 1-8 are included; wherein the Boost power supply includes a master control chip, a first output capacitor, a second output capacitor, an isolation diode, a boost inductor, a switching transistor, an output switch, a current sampling resistor, a first voltage sampling resistor, and a second voltage sampling resistor; a first pin of the master control chip is connected with an enable signal input end of the Boost power supply, a second pin of the master control chip is connected with a control end of the switching transistor, a third pin of the master control chip is connected with a first end of the current sampling resistor, and a fourth pin of the master control chip is connected with a first end of the second voltage sampling resistor; a first end of the switching transistor is connected with a first end of the first output capacitor through the boost inductor, the first end of the first output capacitor is connected with a battery, a second end of the first output capacitor is connected with a fifth power supply, a second end of the switching transistor is connected with the fifth power supply through the current sampling resistor, and a first end of the current sampling resistor is used as a current sampling signal feedback end of the Boost power supply; a first pole of the isolation diode is connected with the first end of the switching transistor, a second pole of the isolation diode is connected with a first end of the second output capacitor, and a second end of the second output capacitor is connected with the second end of the switching transistor; a first end of the first voltage sampling resistor is connected with an output end of the Boost power supply, a second end of the first voltage sampling resistor is connected with the second pole of the isolation diode, a first end of the second voltage sampling resistor is connected with the second end of the first voltage sampling resistor, and a second end of the second voltage sampling resistor is connected with the fifth power supply; the detection module includes an amplification and voltage offset unit, a delay unit, and a hysteresis comparison unit; the amplification and voltage offset unit includes a first input end, a second input end, a third input end, a fourth input end, a fifth input end, and a first output end; the first input end of the amplification and voltage offset unit is connected with the first input end of the detection module, the second input end of the amplification and voltage offset unit is connected with the second input end of the detection module, the third input end of the amplification and voltage offset unit is connected with the third input end of the detection module, the fourth input end of the amplification and voltage offset unit is connected with the fourth input end of the detection module, the fifth input end of the amplification and voltage offset unit is connected with the fifth power supply, and the amplification and voltage offset unit is used for amplifying and voltage offsetting the current received by the current sampling signal feedback end; the delay unit includes a first input end, a second input end, and an output end; the first input end of the delay unit is connected with the first output end of the amplification and voltage offset unit, and the second input end of the delay unit is connected with the fifth power supply. The hysteresis comparison unit comprises a first input end, a second input end, a third input end and an output end; the first input end of the hysteresis comparison unit is connected with the output end of the delay unit, the second input end of the hysteresis comparison unit is connected with the fifth input end of the detection module, the third input end of the hysteresis comparison unit is connected with the fifth power supply, and the output end of the hysteresis comparison unit is connected with the output end of the detection module; the hysteresis comparison unit is used for generating the output shutdown signal when the current of the current sampling signal feedback end after amplification and voltage offset is greater than or equal to a preset overcurrent voltage value; and the delay unit is used for controlling the hysteresis comparison unit to continuously output the output shutdown signal within the preset time period.

Images