Capacitor discharge circuit and electronic device
By designing a capacitive discharge circuit for BMS, using the signal generation module and control module to quickly release the power, the problem of slow charge release in BMS shutdown mode is solved, and a faster shutdown process and lower power consumption is achieved.
Patent Information
- Application Number
- CN202420213315.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-26
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-01-26
AI Technical Summary
When the BMS enters shutdown mode, the charge stored in the capacitor in the power supply circuit is released slowly, resulting in an extended shutdown time and increasing circuit power consumption.
A capacitor discharge circuit is designed, including a signal generation module, a discharge module, an equivalent capacitor and a control module. When the system enters the shutdown state, the signal generation module outputs a low level signal or a high level signal, and the control module uses the first switching tube to quickly release the power of the equivalent capacitor.
By quickly releasing power, the BMS shutdown time is shortened, the circuit prevents additional power consumption and improves the system's low power performance.
Smart Images
Figure CN222602266U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of electronic circuits, and more specifically to a capacitor discharge circuit and an electronic device. Background Art
[0002] The vigorous development of the new energy industry has ushered in a big explosion in the battery industry. Lithium iron phosphate batteries have unparalleled advantages with their high safety and long life. However, due to their own characteristics, a battery management system (BMS) is needed to protect and regulate them. The main function of BMS is to monitor the voltage, temperature, charge and discharge current of each cell in the battery pack, realize the control of the battery pack charge and discharge, communication with the robot host, and balance of the cells.
[0003] As an energy supply component, the battery pack should reduce its own power consumption as much as possible and leave more energy for the powered equipment. Therefore, the low power consumption of BMS becomes the key to the design of the solution. The industry divides the operating status of BMS into three modes. The first is the shutdown mode or warehouse mode. In this state, the BMS has no function, the main charging and discharging circuit is also open, the entire system is in a power-off state, and the power consumption is minimal; the second is the working mode. In this state, the BMS has all the functions designed by the solution, the entire system is in an active state, and the power consumption will reach the maximum system power consumption; the third is the sleep mode or low power mode. In this state, the BMS only has key functions, and the power consumption is greatly reduced compared to the working mode. Therefore, the robot battery pack BMS has formed such an operating logic: when the robot is working, the BMS is in working mode, and when the robot is ready for operation, the BMS is in sleep mode. If it is not used for a long time or during transportation, the BMS is in shutdown mode.
[0004] However, when the BMS enters shutdown mode, the charge stored in the capacitor in the power supply circuit is released slowly, which on the one hand causes the BMS shutdown time to be prolonged, and on the other hand, also increases the power consumption of the circuit. Utility Model Content
[0005] The present application is proposed to solve the above-mentioned problems. According to one aspect of the present application, a capacitor discharge circuit is provided, which includes: a signal generating module, which is used to generate a first level signal; a discharge module, which includes a first switch tube and a first resistor, and the signal generating module is electrically connected to the discharge module; an equivalent capacitor, which is electrically connected to the discharge module; when the signal generating module stops outputting the first level signal, the equivalent capacitor releases electricity through the discharge module.
[0006] As a preferred solution of the present utility model, the capacitor discharge circuit further includes a residual pressure release module, the residual pressure release module includes a second resistor, and the residual pressure release module is electrically connected to the discharge module.
[0007] As a preferred solution of the utility model, the capacitor discharge circuit also includes a control module, one end of the control module is electrically connected to the signal generating module, the other end of the control module is electrically connected to the discharge module, and the control module is used to control the shutdown of the first switch tube.
[0008] As a preferred solution of the utility model, the control module includes a second switch tube. When the signal generating module outputs the first level signal, the first level signal is a low level signal, and the second switch tube is turned on to control the first switch tube to be turned off.
[0009] As a preferred solution of the utility model, the control module also includes a third switch tube. When the signal generating module outputs the first level signal, the first level signal is a high level signal, and the third switch tube is turned on to control the first switch tube to be turned off.
[0010] As a preferred solution of the utility model, the first switch tube is a P-channel MOS tube with a low turn-on voltage.
[0011] As a preferred solution of the present invention, the second switch tube is a P-channel MOS tube.
[0012] As a preferred solution of the present utility model, the third switch tube is an N-channel MOS tube.
[0013] As a preferred solution of the present utility model, one end of the first resistor is electrically connected to the third end of the first switch tube, and the other end of the first resistor is grounded; the first end of the first switch tube is electrically connected to the power supply end, and the second end of the first switch tube is electrically connected to the control module.
[0014] As a preferred solution of the utility model, one end of the second resistor is electrically connected to the first end of the first switch tube, and the other end of the second resistor is grounded.
[0015] As a preferred solution of the utility model, the control module also includes a third resistor, one end of the third resistor is electrically connected to the first end of the second switch tube, and the other end of the third resistor is electrically connected to the third end of the third switch tube; a fourth resistor, one end of the fourth resistor is electrically connected to the second end of the second switch tube, and the other end of the fourth resistor is electrically connected to the third end of the third switch tube; a fifth resistor, one end of the fifth resistor is electrically connected to the second end of the third switch tube, and the other end of the fifth resistor is electrically connected to the signal generating module; a sixth resistor, one end of the sixth resistor is electrically connected to the second end of the third switch tube, and the other end of the sixth resistor is grounded; a seventh resistor, one end of the seventh resistor is electrically connected to the third end of the second switch tube, and the other end of the seventh resistor is grounded.
[0016] In another aspect, the present application provides an electronic device comprising any one of the above circuit structures.
[0017] likeFigure 1 As shown, the signal generating module 10 is electrically connected to the discharge module 11, and the equivalent capacitor 12 is electrically connected to the discharge module 11. The signal generating module 10 is used to generate a first level signal. When the signal generating module 10 stops outputting the first level signal, the equivalent capacitor 12 releases electricity through the discharge module 11.
[0018] Optional, such as Figure 2 As shown, the discharge module 11 includes a first switch tube 111 and a first resistor R1.
[0019] Optional, such as Figure 3 As shown, the capacitor discharge circuit further includes a residual pressure release module 13, and the residual pressure release module is electrically connected to the discharge module.
[0020] Optional, such as Figure 4 As shown, the residual pressure release module 13 includes a second resistor R2.
[0021] Optional, such as Figure 5 As shown, the capacitor discharge circuit also includes a control module 14 , one end of the control module 14 is electrically connected to the signal generating module 10 , and the other end of the control module 14 is electrically connected to the discharge module 11 . The control module 14 is used to control the turn-off of the first switch tube 111 .
[0022] Optional, such as Figure 6 As shown, the control module 14 includes a second switch tube 142 and a third switch tube 143. When the signal generating module 10 outputs a low-level signal, the second switch tube 142 is turned on to control the first switch tube 111 to be disconnected. When the signal generating module 10 outputs a high-level signal, the third switch tube 143 is turned on to control the first switch tube 111 to be disconnected.
[0023] Optional, such as Figure 7 As shown, the first switch tube 111 is a P-channel MOS tube with a low turn-on voltage, the second switch tube 142 is a P-channel MOS tube, and the third switch tube 143 is an N-channel MOS tube.
[0024] One end of the first resistor R1 is electrically connected to the third end of the first switch tube 111, the other end of the first resistor R1 is grounded, the first end of the first switch tube 111 is electrically connected to the power supply end VCC, the second end of the first switch tube 111 is electrically connected to the control module 14, one end of the second resistor R2 is electrically connected to the first end of the first switch tube 111, and the other end of the second resistor R2 is grounded.
[0025] The control module 14 also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, one end of the third resistor R3 is electrically connected to the first end of the second switch tube 142, the other end of the third resistor R3 is electrically connected to the third end of the third switch tube 143, one end of the fourth resistor R4 is electrically connected to the second end of the second switch tube 142, the other end of the fourth resistor R4 is electrically connected to the third end of the third switch tube 143, one end of the fifth resistor R5 is electrically connected to the second end of the third switch tube 143, the other end of the fifth resistor R5 is electrically connected to the signal generating module 10, one end of the sixth resistor R6 is electrically connected to the second end of the third switch tube 143, the other end of the sixth resistor R6 is grounded, one end of the seventh resistor R7 is electrically connected to the third end of the second switch tube 142, and the other end of the seventh resistor R7 is grounded.
[0026] A capacitor discharge circuit and an electronic device according to the embodiments of the present application have the following beneficial effects: when the BMS enters the shutdown mode, the utility model uses a signal generating module to enable the equivalent capacitor to quickly release electricity through the discharge module, thereby shortening the shutdown time and preventing the circuit from increasing additional power consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic structural block diagram of a capacitor discharge circuit according to a specific embodiment of the present application.
[0028] Figure 2 It is a schematic structural block diagram of a capacitor discharge circuit according to another specific embodiment of the present application.
[0029] Figure 3 It is a schematic structural block diagram of a capacitor discharge circuit according to another specific embodiment of the present application.
[0030] Figure 4 It is a schematic structural block diagram of a capacitor discharge circuit according to another specific embodiment of the present application.
[0031] Figure 5 It is a schematic structural block diagram of a capacitor discharge circuit according to another specific embodiment of the present application.
[0032] Figure 6 It is a schematic structural block diagram of a capacitor discharge circuit according to another specific embodiment of the present application.
[0033] Figure 7 It is a circuit diagram of a capacitor discharge circuit according to a specific embodiment of the present application. DETAILED DESCRIPTION
[0034] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.
[0035] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.
[0036] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.
[0037] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.
[0038] Some implementation methods of the present utility model are described in detail below in conjunction with the accompanying drawings.
[0039] like Figure 7 As shown, when the system is in the power-on state, the first switch tube 111 is closed, and the discharge module 11 does not work. When the system is powered off, the first switch tube 111 is opened, and the equivalent capacitor C is discharged through the first resistor R1 to complete the entire shutdown process. The key is to use the signal generation module 10 to output a low-level signal or a high-level signal to control the first switch tube 111. In the electronics industry, the most widely used switch device is the MOS tube, and PMOS is used as the first switch tube 111. However, considering that a certain voltage is required to turn on the MOS tube, the equivalent capacitor C has a residual voltage lower than the MOS tube turn-on voltage in the later stage of discharge. In order to release the residual voltage, a second resistor R2 is hung to provide an effective path for releasing the residual voltage.
[0040] The control module 14 is composed of a second switch tube PMOS tube 142, a third switch tube NMOS tube 143 and voltage-dividing resistors R3-R7. In the power-on state, if the signal generating module 10 outputs a high-level signal, it is connected to the high-level control signal output terminal, and the high-level signal turns on the third switch tube NMOS tube 143, thereby turning on the second switch tube PMOS tube 142, turning off the first switch tube PMOS tube 111, and closing the capacitor discharge loop; if the signal generating module 10 outputs a low-level signal, it is connected to the low-level control signal output terminal, and the low level turns on the second switch tube PMOS tube 142, thereby turning off the first switch tube PMOS tube 111, and closing the capacitor discharge loop. In the power-off state, the low-level signal and the high-level signal all disappear, the third switch tube NMOS tube 143 is turned off, the second switch tube PMOS tube 142 is turned off, and the first switch tube PMOS tube 111 is turned on for discharge.
[0041] The discharge module 11 is composed of a first switch tube PMOS tube 111 and a first resistor R1. The first switch tube PMOS tube 111 is responsible for switching on and off the capacitor discharge circuit, and the first resistor R1 is used to limit the size of the discharge current to prevent the discharge current from being too large and damaging the device.
[0042] The residual voltage release module 13 is composed of a second resistor R2, and a larger resistor is used to pull through the capacitor discharge circuit to release the residual electricity remaining because the capacitor voltage is lower than the turn-on voltage of the first switch tube PMOS tube 111, so that the electricity stored in the equivalent capacitor C can be completely released when the power is turned off.
[0043] The control module 14 is connected to the signal generating module 10. The signal generating module 10 has two signal output ports, one is a high-level control signal output port, and the other is a low-level control signal output port. Either of the two ports is sufficient. The control module 14 has two output ports, which are respectively at the drain and source of the second switch tube PMOS tube 142. The source of the second switch tube PMOS tube 142 is connected to the source of the first switch tube PMOS tube 111 in the discharge module 11, and the drain of the second switch tube PMOS tube 142 is connected to the gate of the first switch tube PMOS tube 111 in the discharge module 11.
[0044] The discharge module 11 has an input terminal connected to the power supply terminal VCC, a source of the first switch tube PMOS tube 111 connected to the source of the second switch tube PMOS tube 142 in the control module 14, and a gate of the first switch tube PMOS tube 111 connected to the drain of the second switch tube PMOS tube 142 in the control module 14.
[0045] The residual pressure release module 13 is connected in parallel to the discharge module 11 .
[0046] Preferably, the first resistor R1 is a 100Ω resistor packaged in 1206, the second resistor R2, the fourth resistor R4, the sixth resistor R6, and the seventh resistor R7 are 1MΩ resistors packaged in 0603, the third resistor R3 is a 10MΩ resistor packaged in 0603, and the fifth resistor R5 is a 1kΩ resistor packaged in 0603.
[0047] Preferably, the first switch tube 111 should be a P-channel MOS tube with a low turn-on voltage, the second switch tube 142 should be a P-channel MOS tube, and the third switch tube 143 should be an N-channel MOS tube.
[0048] Exemplarily, the working principle of the capacitor discharge circuit is described as follows. When the system is in the power-on state (working mode or sleep mode), the presence of the low-level signal or the high-level signal makes the second switch tube PMOS tube 142 in the control module 14 in the on state, thereby making the first switch tube PMOS tube 111 in the discharge module 11 in the off state, and the resistance values of the second resistor R2, the third resistor R3, the fourth resistor R4, and the seventh resistor R7 are large enough, so it can be ensured that there is no abnormal circuit leakage in the system in the power-on state, and the low power consumption design of the system is not damaged; on the contrary, when the system enters the shutdown state, the disappearance of the low-level signal and the high-level signal makes the second switch tube PMOS tube 142 in the control module 14 in the off state, thereby making the first switch tube PMOS tube 111 in the discharge module 11 in the on state, and the equivalent capacitor C is quickly discharged through the discharge module 11. When the capacitor voltage is lower than the start-up voltage of the first switch tube PMOS tube 111, the first switch tube PMOS tube 111 is turned off, the discharge module 11 stops discharging, and the remaining electricity in the equivalent capacitor C continues to be discharged through the residual pressure release module 13 until it is emptied.
[0049] Optionally, if you want to increase the speed of releasing the residual pressure, you can appropriately reduce the resistance of the second resistor R2.
[0050] The low-level signal and high-level signal generated by the instantaneous signal generation module of the utility model when the power is turned off no longer exist, and the system power supply has been cut off. There is no need for another voltage signal to drive the first switch tube PMOS tube of the discharge module to turn on after the power is turned off. The first switch tube PMOS tube is driven by the fully charged capacitor voltage to turn on, and then the capacitor starts to discharge quickly through the first switch tube PMOS tube and the first resistor. This shortens the shutdown time and prevents the circuit from increasing additional power consumption. At the same time, when the discharge module discharges to a capacitor voltage lower than the first switch tube PMOS tube turn-on voltage, the first switch tube PMOS tube is turned off, and the residual electricity can be completely released through the second resistor.
[0051] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.
[0052] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.
[0053] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.
[0054] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.
Claims
1. A capacitor discharge circuit, characterized in that: The capacitor discharge circuit comprises: A signal generating module, wherein the signal generating module is used to generate a first level signal; A discharge module, the discharge module comprising a first switch tube and a first resistor, the signal generating module being electrically connected to the discharge module; an equivalent capacitor, the equivalent capacitor being electrically connected to the discharge module; When the signal generating module stops outputting the first level signal, the equivalent capacitor releases electricity through the discharge module.
2. The capacitor discharge circuit according to claim 1, characterized in that: The capacitor discharge circuit also includes: A residual pressure release module, wherein the residual pressure release module comprises a second resistor and the residual pressure release module is connected in parallel with the discharge module.
3. The capacitor discharge circuit according to claim 1, characterized in that: The capacitor discharge circuit also includes: A control module, one end of which is electrically connected to the signal generating module, and the other end of which is electrically connected to the discharge module, and the control module is used to control the shut-off of the first switch tube.
4. The capacitor discharge circuit according to claim 3, characterized in that: The control module comprises: a second switch tube, wherein the first end of the second switch tube is electrically connected to the first end of the first switch tube, the third end of the second switch tube is electrically connected to the second end of the first switch tube, the second end of the second switch tube is electrically connected to the signal generating module, and when the signal generating module outputs a first level signal, the first level signal is a low level signal, and the second switch tube is turned on, so as to control the first switch tube to be disconnected.
5. The capacitor discharge circuit according to claim 4, characterized in that: The control module also includes: a third switch tube, wherein the third end of the third switch tube is electrically connected to the second end of the second switch tube, the first end of the third switch tube is grounded, and the second end of the third switch tube is electrically connected to the signal generating module; when the signal generating module outputs a first level signal, the first level signal is a high level signal, and the third switch tube is turned on, so as to control the first switch tube to be disconnected.
6. The capacitor discharge circuit according to claim 1, characterized in that: The first switch tube is a P-channel MOS tube with a low turn-on voltage.
7. The capacitor discharge circuit according to claim 4, characterized in that: The second switch tube is a P-channel MOS tube.
8. The capacitor discharge circuit according to claim 5, characterized in that: The third switch tube is an N-channel MOS tube.
9. The capacitor discharge circuit according to claim 3, characterized in that: One end of the first resistor is electrically connected to the third end of the first switch tube, and the other end of the first resistor is grounded; The first end of the first switch tube is electrically connected to the power supply end, and the second end of the first switch tube is electrically connected to the control module.
10. The capacitor discharge circuit according to claim 2, characterized in that: One end of the second resistor is electrically connected to the first end of the first switch tube, and the other end of the second resistor is grounded.
11. The capacitor discharge circuit according to claim 5, characterized in that: The control module also includes: a third resistor, one end of the third resistor being electrically connected to the first end of the second switch tube, and the other end of the third resistor being electrically connected to the third end of the third switch tube; a fourth resistor, one end of the fourth resistor being electrically connected to the second end of the second switch tube, and the other end of the fourth resistor being electrically connected to the third end of the third switch tube; a fifth resistor, one end of the fifth resistor being electrically connected to the second end of the third switch tube, and the other end of the fifth resistor being electrically connected to the signal generating module; a sixth resistor, one end of the sixth resistor being electrically connected to the second end of the third switch tube, and the other end of the sixth resistor being grounded; A seventh resistor, one end of the seventh resistor is electrically connected to the third end of the second switch tube, and the other end of the seventh resistor is grounded.
12. An electronic device, characterized in that: Comprising a capacitor discharge circuit as described in any one of claims 1-11.