Electric energy discharge control device

Abstract

The invention discloses an electric energy discharge control device which comprises an energy storage circuit, a discharge circuit, a reference voltage setting circuit, a discharge current collection feedback circuit and an energy discharge control circuit. The energy storage circuit is used for storing potential storage electric energy, the bleeder circuit is used for releasing the potential storage electric energy through a bleeder resistor and a bleeder transistor which are connected in series, the reference voltage setting circuit is used for outputting a reference voltage signal, and the bleeder current collection feedback circuit is used for outputting a bleeder current collection feedback electric signal. And the energy release control circuit is used for controlling the conduction degree of the discharge transistor according to the reference voltage signal and the discharge current collection feedback electric signal. The conduction degree of the bleeder transistor is dynamically controlled through the bleeder current collection feedback electric signal output by the bleeder current collection feedback circuit, so that the change of potential storage electric energy of the energy storage device is dynamically adapted, the bleeder power of the bleeder circuit is stable and controllable, and the higher bleeder efficiency can be realized under the condition that the bleeder power is limited.

Description

Technical Field

[0001] This application relates to the field of power supply circuit technology, specifically to an energy discharge control device. Background Technology

[0002] The purpose of adding a rapid energy discharge function to a power supply circuit is to quickly and safely release the residual energy in energy storage components (such as capacitors and inductors) when the system encounters a fault, emergency shutdown, or requires rapid reset. This prevents voltage buildup, ensures the safety of personnel (e.g., in the high-voltage system of an electric vehicle, in an emergency such as a collision, the voltage on the high-voltage bus must be reduced below the safe voltage within seconds to prevent the risk of electric shock) and equipment (e.g., when the load changes suddenly or the power is turned off, excess energy accumulated in the circuit, if not discharged in time, will cause a sudden voltage rise, which may damage delicate electronic components), or meet specific testing needs (e.g., in testing, pulse power, and other fields, the power supply needs to have rapid response and discharge capabilities to simulate real working conditions or prepare for the next operation). Rapid discharge technology is developing towards being more intelligent, more integrated, and more efficient. Summary of the Invention

[0003] The main technical problem solved by this invention is how to adapt to the dynamic changes in the stored energy of the energy storage device during the energy discharge process, so as to make the discharge power of the discharge circuit stable and controllable.

[0004] According to a first aspect, one embodiment provides a power discharge control device, comprising:

[0005] An energy storage circuit, including an energy storage device, wherein the energy storage device is used to store stored electrical energy;

[0006] The bleeder circuit includes a bleeder resistor R connected in series. s And a discharge transistor Q1, and connected in parallel with the energy storage device of the energy storage circuit, for use when the discharge transistor Q1 is turned on, through the discharge transistor Q1 and the discharge resistor R s Release the stored electrical energy from the energy storage device;

[0007] Reference voltage setting circuit, used to output a reference voltage signal with a preset voltage value;

[0008] The bleed current sampling feedback circuit is used to provide feedback to the current flowing through the bleed current resistor R when the bleed current transistor Q1 is turned on. s The discharge current is sampled, and a discharge current sampling feedback signal is output based on the obtained discharge sampling current. The voltage value of the discharge current sampling feedback signal is positively correlated with the current value of the discharge current.

[0009] The energy discharge control circuit is connected to the control electrode of the discharge transistor Q1 and is used to control the conduction degree of the discharge transistor Q1 according to the reference voltage signal and the discharge current sampling feedback signal, so as to dynamically control the discharge current of the discharge circuit.

[0010] In one embodiment, the power discharge control device further includes:

[0011] The subsequent voltage feedback circuit is used to monitor the storage voltage of the energy storage device and output a subsequent voltage feedback electrical signal based on the storage voltage.

[0012] The energy dissipation control circuit is used to control the conduction degree of the discharge transistor Q1 based on the subsequent voltage feedback signal, the reference voltage signal, and the discharge sampling feedback signal.

[0013] In one embodiment, the energy storage device is an energy storage capacitor C0; the energy storage circuit further includes a current sampling resistor R0; the current sampling resistor R0 is connected in series with the energy storage capacitor C0;

[0014] The power discharge control device also includes:

[0015] The post-stage current sampling feedback circuit is used to sample the post-stage current flowing through the current sampling resistor R0, and output the post-stage current sampling feedback electrical signal based on the obtained post-stage sampled current.

[0016] The discharge control circuit is used to control the conduction degree of the discharge transistor Q1 based on the subsequent current sampling feedback signal, the subsequent voltage feedback signal, the reference voltage signal, and the discharge current sampling feedback signal.

[0017] In one embodiment, the discharge circuit further includes a fuse FUSE, and the discharge resistor R s It is connected in series with the discharge transistor Q1.

[0018] In one embodiment, the energy storage circuit further includes a downstream connection terminal, a upstream connection terminal, and a common connection terminal;

[0019] The current-collecting resistor R0 is connected in series with the energy storage capacitor C0. One end of the current-collecting resistor R0 is used as the downstream connection terminal, and the other end of the current-collecting resistor R0 is used as the common connection terminal. The connection terminal of the current-collecting resistor R0 and the energy storage capacitor C0 is used as the upstream connection terminal. The upstream connection terminal and the common connection terminal are used as the upstream power supply connection terminals for storing energy in the energy storage capacitor C0. The downstream connection terminal and the common connection terminal are used as the downstream power-consuming load connection terminals for discharging the stored energy in the energy storage capacitor C0.

[0020] The discharge transistor Q1 further includes a first connection terminal and a second connection terminal; the first connection terminal of the discharge transistor Q1 is electrically connected to the common connection terminal, and the second connection terminal of the discharge transistor Q1 is connected to the discharge resistor R. s One end is electrically connected to the discharge resistor R. s The other end is electrically connected to the pre-amplifier connection terminal.

[0021] In one embodiment, the energy leakage control circuit includes a first operational amplifier U1, a first resistor R1, a second resistor R2, a first output terminal, a first input terminal, and a second input terminal;

[0022] The first output terminal of the energy discharge control circuit is connected to the control electrode of the discharge transistor Q1, the first input terminal of the energy discharge control circuit is connected to the reference voltage setting circuit, and the second input terminal of the energy discharge control circuit is connected to the discharge current sampling feedback circuit.

[0023] One end of the first resistor R1 is connected to the output terminal of the first operational amplifier U1, and the other end is connected to the first output terminal of the energy dissipation control circuit.

[0024] One end of the second resistor R2 is connected to the first input terminal of the energy leakage control circuit, and the other end is connected to the negative input terminal of the first operational amplifier U1;

[0025] The positive input terminal of the first operational amplifier U1 is used as the second input terminal of the energy dissipation control circuit.

[0026] In one embodiment, the discharge current sampling feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a third resistor R3, and a fourth resistor R4;

[0027] The first connection terminal of the discharge current sampling feedback circuit is connected to the second connection terminal of the discharge transistor Q1;

[0028] The second connection terminal of the discharge current sampling feedback circuit is connected to the first input terminal of the energy discharge control circuit.

[0029] The third connection terminal of the discharge current sampling feedback circuit is connected to the second input terminal of the energy discharge control circuit;

[0030] One end of the third resistor R3 is connected to the first connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the second connection terminal of the discharge current sampling feedback circuit.

[0031] One end of the fourth resistor R4 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is grounded;

[0032] Alternatively, the discharge current sampling feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, a third resistor R3, a fourth resistor R4, and a fifth resistor R5;

[0033] The first connection terminal of the discharge current sampling feedback circuit is connected to the second connection terminal of the discharge transistor Q1;

[0034] The second connection terminal of the discharge current sampling feedback circuit is connected to the first input terminal of the energy discharge control circuit.

[0035] The third connection terminal of the discharge current sampling feedback circuit is connected to the second input terminal of the energy discharge control circuit;

[0036] The fourth connection terminal of the discharge current sampling feedback circuit is connected to the front-end connection terminal;

[0037] One end of the third resistor R3 is connected to the first connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the second connection terminal of the discharge current sampling feedback circuit.

[0038] One end of the fourth resistor R4 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is grounded;

[0039] One end of the fifth resistor R5 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the fourth connection terminal of the discharge current sampling feedback circuit.

[0040] In one embodiment, the subsequent current sampling feedback circuit includes a first connection terminal, a second connection terminal, and a sixth resistor R6;

[0041] The first connection terminal of the downstream current sampling feedback circuit is connected to the downstream connection terminal, and the second connection terminal of the downstream current sampling feedback circuit is connected to the first input terminal of the energy leakage control circuit.

[0042] One end of the sixth resistor R6 is connected to the first connection terminal of the subsequent current sampling feedback circuit, and the other end is connected to the second connection terminal of the subsequent current sampling feedback circuit.

[0043] Alternatively, the subsequent current sampling feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a second operational amplifier U2.

[0044] The first connection terminal of the subsequent current sampling feedback circuit is connected to the subsequent connection terminal, the second connection terminal of the subsequent current sampling feedback circuit is connected to the first input terminal of the energy leakage control circuit, and the third connection terminal of the subsequent current sampling feedback circuit is connected to the preceding connection terminal.

[0045] One end of the sixth resistor R6 is connected to the second connection terminal of the subsequent current sampling feedback circuit, and the other end is connected to the output terminal of the second operational amplifier U2.

[0046] One end of the seventh resistor R7 is connected to the negative input terminal of the second operational amplifier U2, and the other end is connected to the third connection terminal of the subsequent current sampling feedback circuit.

[0047] One end of the eighth resistor R8 is connected to the positive input terminal of the second operational amplifier U2, and the other end is grounded;

[0048] One end of the ninth resistor R9 is connected to the negative input terminal of the second operational amplifier U2, and the other end is connected to the output terminal of the second operational amplifier U2.

[0049] One end of the tenth resistor R10 is connected to the first connection terminal of the subsequent current sampling feedback circuit, and the other end is connected to the positive input terminal of the second operational amplifier U2.

[0050] In one embodiment, the subsequent voltage feedback circuit includes a first connection terminal, a second connection terminal, and an eleventh resistor R11;

[0051] The first connection terminal of the subsequent voltage feedback circuit is connected to the common connection terminal, and the second connection terminal of the subsequent voltage feedback circuit is connected to the first input terminal of the energy leakage control circuit.

[0052] One end of the eleventh resistor R11 is connected to the first connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the second connection terminal of the subsequent voltage feedback circuit.

[0053] Alternatively, the subsequent voltage feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a third operational amplifier U3.

[0054] The first connection terminal of the subsequent voltage feedback circuit is connected to the common connection terminal, the second connection terminal of the subsequent voltage feedback circuit is connected to the first input terminal of the energy leakage control circuit, and the third connection terminal of the subsequent voltage feedback circuit is connected to the subsequent connection terminal.

[0055] One end of the eleventh resistor R11 is connected to the second connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the output terminal of the third operational amplifier U3.

[0056] One end of the twelfth resistor R12 is connected to the negative input terminal of the third operational amplifier U3, and the other end is connected to the third connection terminal of the subsequent voltage feedback circuit.

[0057] One end of the thirteenth resistor R13 is connected to the positive input terminal of the third operational amplifier U3, and the other end is grounded;

[0058] One end of the fourteenth resistor R14 is connected to the negative input terminal of the third operational amplifier U3, and the other end is connected to the output terminal of the third operational amplifier U3.

[0059] One end of the fifteenth resistor R15 is connected to the first connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the positive input terminal of the third operational amplifier U3.

[0060] In one embodiment, the power discharge control device further includes:

[0061] An enable signal control circuit is used to output a discharge start electrical signal to the discharge control circuit in response to a preset enable signal En-N, so that the discharge control circuit can control the conduction of the discharge transistor Q1 in response to the discharge start electrical signal; the enable signal control circuit includes an optocoupler for opto-isolating the discharge start electrical signal and the enable signal En-N.

[0062] According to the above embodiment, the power discharge control device dynamically controls the conduction degree of the discharge transistor by the discharge current sampling feedback electrical signal output by the discharge current sampling feedback circuit, thereby dynamically adapting to the changes in the stored energy of the energy storage device, so that the discharge power of the discharge circuit is stable and controllable, and a faster discharge rate can be achieved under the condition of limited discharge power. Attached Figure Description

[0063] Figure 1 This is a functional structural connection block diagram of a power discharge control device in one embodiment;

[0064] Figure 2 This is a circuit connection diagram of the energy discharge control device when the reference ground of the energy storage power supply is negative in one embodiment.

[0065] Figure 3 This is a circuit connection diagram of the energy discharge control device when the reference ground of the energy storage power supply is negative in another embodiment;

[0066] Figure 4 This is a circuit connection diagram of the energy discharge control device when the reference ground of the energy storage power supply is positive in one embodiment;

[0067] Figure 5 This is a circuit connection diagram of the energy discharge control device when the reference ground of the energy storage power supply is positive in another embodiment;

[0068] Figure 6 This is a schematic diagram showing the instantaneous discharge current, subsequent output current, and storage voltage in one embodiment.

[0069] Figure 7 This is a schematic diagram showing the instantaneous discharge power, subsequent output current, and storage voltage in one embodiment;

[0070] Figure 8 A comparison graph of the time curves of the remaining voltage;

[0071] Figure 9 A comparison graph of the time curves for the discharge current;

[0072] Figure 10 A comparison graph of the time curves for discharging power. Detailed Implementation

[0073] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0074] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0075] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0076] Power supply circuits contain large capacitors. When voltage drops, shutdowns, or abnormal protection are required, safe and rapid discharge is necessary. Discharge is applied as needed to generate discharge power. For adjustable power supplies and other scenarios requiring rapid voltage drops, discharge must be continuously connected, with the discharge power flexibly adjusted according to the scenario. Generally, there are two main categories of scenarios requiring discharge. The first is detecting signals and controlling the discharge circuit's on / off state. For example, the power supply voltage needs to be quickly cut off to prevent electric shock or circuit damage; abnormal overvoltage protection is needed, such as when a sudden decrease in load / shutdown causes inductive effects or other reasons leading to pulses or even breakdown discharges. The second category requires the discharge circuit to be continuously connected, such as adjustable power supplies requiring rapid voltage drops with specific voltage drop slope requirements. Discharge circuits in various scenarios have limitations on discharge power, and all require faster discharge, rapid control circuit response, and ease of implementation. Currently, most power discharge methods use resistor discharge, i.e., using resistors to discharge power. One method involves controlling the on / off state using transistors connected in series. The key is often how to detect signals and control the transistors, with the discharge power entirely borne by the resistors. Another type is a resistor connected in series with a transistor. The circuit controls the transistor to achieve a constant current, the resistor's power is constant, and the transistor's power decreases as the voltage drops. To increase the discharge speed, the only way is to control the resistor to maintain a constant current. However, in some operating scenarios, uncontrolled discharge operations (high power at the beginning of discharge or when the voltage is high, requiring high device specifications and heat dissipation; low power at the end of discharge or when the voltage is low, resulting in slow discharge) can affect surrounding electronic devices and heat dissipation.

[0077] In this embodiment, the discharge current is automatically adjusted according to the load to reduce the power as needed until the discharge ends, thereby ensuring that the discharge operation can be completed faster under the same power limit.

[0078] Example 1:

[0079] Please refer to Figure 1 The diagram below shows the functional structure of a power discharge control device in one embodiment. The power discharge control device includes an energy storage circuit 1, a discharge circuit 2, a reference voltage setting circuit 8, a discharge control circuit 3, a subsequent voltage feedback circuit 4, a subsequent current sampling feedback circuit 5, a discharge current sampling feedback circuit 6, and an enable signal control circuit 7. The energy storage circuit 1 includes an energy storage device for storing stored electrical energy. The discharge circuit 2 includes a discharge resistor R connected in series. s And a discharge transistor Q1, and connected in parallel with the energy storage device of energy storage circuit 1, used to discharge the energy through the discharge transistor Q1 and the discharge resistor R when the discharge transistor Q1 is turned on. s Release the stored electrical energy from the energy storage device. The reference voltage setting circuit 8 outputs a reference voltage signal with a preset voltage value. The discharge current sampling feedback circuit 6 is used to control the current flowing through the discharge resistor R when the discharge transistor Q1 is turned on. sThe discharge current is sampled, and a discharge current sampling feedback signal is output based on the obtained discharge sampling current. The voltage value of the discharge current sampling feedback signal is positively correlated with the current value of the discharge current. The discharge control circuit 3, connected to the control electrode of the discharge transistor Q1, is used to control the conduction level of the discharge transistor Q1 based on the reference voltage signal and the discharge current sampling feedback signal, thereby dynamically controlling the discharge current of the discharge circuit. In one embodiment, the discharge transistor Q1 is an NMOS transistor.

[0080] In one embodiment, the downstream voltage feedback circuit 4 is used to monitor the storage voltage of the energy storage device and output a downstream voltage feedback signal based on the storage voltage. The discharge control circuit 3 is used to control the conduction level of the discharge transistor Q1 based on the downstream voltage feedback signal, the reference voltage signal, and the discharge sampling feedback signal.

[0081] Please refer to Figure 2 This is a circuit connection diagram of the energy discharge control device when the reference ground of the energy storage power supply is negative in one embodiment. In one embodiment, the energy storage device is an energy storage capacitor C0, and the energy storage circuit 1 also includes a current sampling resistor R0, which is connected in series with the energy storage capacitor C0. The subsequent current sampling feedback circuit 5 is used to sample the subsequent current flowing through the current sampling resistor R0, and output a subsequent current sampling feedback electrical signal based on the obtained subsequent current sampling. The energy discharge control circuit 3 is used to control the conduction degree of the discharge transistor Q1 based on the subsequent current sampling feedback electrical signal, the subsequent voltage feedback electrical signal, the reference voltage signal, and the discharge current sampling feedback electrical signal. In one embodiment, the discharge circuit 2 also includes a fuse FUSE, connected in series with the discharge resistor R0. s It is connected in series with the discharge transistor Q1.

[0082] like Figure 2 As shown, the energy storage circuit 1 also includes a downstream connection terminal, a upstream connection terminal, and a common connection terminal. A current-sampling resistor R0 is connected in series with the energy storage capacitor C0. The end of the resistor connected in series with R0 serves as the downstream connection terminal, the end connected in series with the energy storage capacitor C0 serves as the common connection terminal, and the connection point between the current-sampling resistor R0 and the energy storage capacitor C0 serves as the upstream connection terminal. The upstream connection terminal and the common connection terminal serve as the upstream power supply connection terminals for storing energy in the energy storage capacitor C0, and the downstream connection terminal and the common connection terminal serve as the downstream power-consuming load connection terminals for discharging the stored energy in the energy storage capacitor C0. Figure 2 As shown, the front-end power supply connection terminal V IN + and the connection terminal of the pre-amplifier power supply V IN - This terminal is electrically connected to both the pre-amplifier connection terminal and the common connection terminal, and is used to store energy in the energy storage capacitor C0. The power-consuming load connection terminal V... OUT + and the connection terminal of the downstream power-consuming load V OUT- This is electrically connected to both the downstream connection terminal and the common connection terminal, respectively, to discharge the stored energy of the energy storage capacitor C0. The upstream power supply connection terminal V... IN -or the downstream power-consuming load connection terminal V OUT - This serves as the reference ground for the power storage device. The discharge transistor Q1 also includes a first connection terminal (drain) and a second connection terminal (source). The first connection terminal of the discharge transistor Q1 is electrically connected to the common connection terminal, and the second connection terminal of the discharge transistor Q1 is connected to the discharge resistor R. s One end is electrically connected to the bleed resistor R. s The other end is electrically connected to the preamplifier terminal.

[0083] The energy dissipation control circuit 3 includes a first operational amplifier U1, a first resistor R1, a second resistor R2, a first output terminal, a first input terminal, and a second input terminal. The first output terminal of the energy dissipation control circuit 3 is connected to the control electrode of the discharge transistor Q1. The first input terminal of the energy dissipation control circuit 3 is connected to the reference voltage setting circuit 8. The second input terminal of the energy dissipation control circuit 3 is connected to the discharge current sampling feedback circuit 6. One end of the first resistor R1 is connected to the output terminal of the first operational amplifier U1, and the other end is connected to the first output terminal of the energy dissipation control circuit 3. One end of the second resistor R2 is connected to the first input terminal of the energy dissipation control circuit 3, and the other end is connected to the negative input terminal of the first operational amplifier U1. The positive input terminal of the first operational amplifier U1 is used as the second input terminal of the energy dissipation control circuit.

[0084] exist Figure 2In the circuit, the discharge current sampling feedback circuit 6 includes a first connection terminal, a second connection terminal, a third connection terminal, a fourth connection terminal, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first connection terminal of the discharge current sampling feedback circuit is connected to the second terminal of the discharge transistor Q1. The second connection terminal of the discharge current sampling feedback circuit is connected to the first input terminal of the discharge control circuit. The third connection terminal of the discharge current sampling feedback circuit is connected to the second input terminal of the discharge control circuit. The fourth connection terminal of the discharge current sampling feedback circuit is connected to the front-end connection terminal. One end of the third resistor R3 is connected to the first connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the second connection terminal of the discharge current sampling feedback circuit. One end of the fourth resistor R4 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is grounded. One end of the fifth resistor R5 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the fourth connection terminal of the discharge current sampling feedback circuit. The current sampling feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a second operational amplifier U2. The first connection terminal of the current sampling feedback circuit is connected to the subsequent stage connection terminal. The second connection terminal of the current sampling feedback circuit is connected to the first input terminal of the energy dissipation control circuit. The third connection terminal of the current sampling feedback circuit is connected to the preceding stage connection terminal. One end of the sixth resistor R6 is connected to the second connection terminal of the current sampling feedback circuit, and the other end is connected to the output terminal of the second operational amplifier U2. One end of the seventh resistor R7 is connected to the negative input terminal of the second operational amplifier U2, and the other end is connected to the third connection terminal of the current sampling feedback circuit. One end of the eighth resistor R8 is connected to the positive input terminal of the second operational amplifier U2, and the other end is grounded. One end of the ninth resistor R9 is connected to the negative input terminal of the second operational amplifier U2, and the other end is connected to the output terminal of the second operational amplifier U2. One end of the tenth resistor R10 is connected to the first connection terminal of the subsequent current sampling feedback circuit, and the other end is connected to the positive input terminal of the second operational amplifier U2. The subsequent voltage feedback circuit includes a first connection terminal, a second connection terminal, a third connection terminal, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, and a third operational amplifier U3. The first connection terminal of the subsequent voltage feedback circuit is connected to the common connection terminal, the second connection terminal is connected to the first input terminal of the energy dissipation control circuit, and the third connection terminal is connected to the subsequent connection terminal. One end of the eleventh resistor R11 is connected to the second connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the output terminal of the third operational amplifier U3. One end of the twelfth resistor R12 is connected to the negative input terminal of the third operational amplifier U3, and the other end is connected to the third connection terminal of the subsequent voltage feedback circuit. One end of the thirteenth resistor R13 is connected to the positive input terminal of the third operational amplifier U3, and the other end is grounded.One end of the fourteenth resistor R14 is connected to the negative input terminal of the third operational amplifier U3, and the other end is connected to the output terminal of the third operational amplifier U3. One end of the fifteenth resistor R15 is connected to the first connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the positive input terminal of the third operational amplifier U3.

[0085] In one embodiment, the enable signal control circuit 7 is used to output a discharge start electrical signal to the discharge control circuit in response to a preset enable signal En-N, so that the discharge control circuit can control the discharge transistor Q1 to turn on in response to the discharge start electrical signal. Figure 2 As shown, the enable signal control circuit 7 includes an optocoupler U4, a sixteenth resistor R16, and a seventeenth resistor R17. The optocoupler U4 is used for opto-isolation of the start signal and the enable signal En-N. The optocoupler U4 includes a first input connection terminal, a second input connection terminal, a first isolated output terminal, and a second isolated output terminal. The first input connection terminal of the optocoupler U4 serves as the input terminal for the enable signal En-N, and the second input connection terminal of the optocoupler U4 is connected to the reference ground of the enable signal En-N. One end of the sixteenth resistor R16 is connected to the positive input terminal of the first operational amplifier U1, and the other end is connected to the first isolated output terminal of the optocoupler U4. One end of the seventeenth resistor R17 is used as the input of a preset first control signal V-, and the other end is connected to the second isolated output terminal of the optocoupler U4.

[0086] The reference voltage setting circuit 8 includes a first connection terminal, a second connection terminal, and an eighteenth resistor R18. The two ends of the eighteenth resistor R18 are connected to the first and second connection terminals of the reference voltage setting circuit, respectively. The first connection terminal of the reference voltage setting circuit is used as the reference voltage signal -V. ref The input terminal of the reference voltage setting circuit is connected to the second connection terminal of the energy dissipation control circuit 3.

[0087] Please refer to Figure 3 The diagram below shows the circuit connection of the energy discharge control device when the reference ground of the power storage power supply is negative in another embodiment. In one embodiment, the discharge current sampling feedback circuit 6 includes a first connection terminal, a second connection terminal, a third connection terminal, a third resistor R3, and a fourth resistor R4. The first connection terminal of the discharge current sampling feedback circuit is connected to the second connection terminal of the discharge transistor Q1. The second connection terminal of the discharge current sampling feedback circuit is connected to the first input terminal of the energy discharge control circuit. The third connection terminal of the discharge current sampling feedback circuit is connected to the second input terminal of the energy discharge control circuit. One end of the third resistor R3 is connected to the first connection terminal of the discharge current sampling feedback circuit, and the other end is connected to the second connection terminal of the discharge current sampling feedback circuit. One end of the fourth resistor R4 is connected to the third connection terminal of the discharge current sampling feedback circuit, and the other end is grounded.

[0088] The subsequent current sampling feedback circuit 5 includes a first connection terminal, a second connection terminal, and a sixth resistor R6. The first connection terminal of the subsequent current sampling feedback circuit is connected to the subsequent connection terminal, and the second connection terminal of the subsequent current sampling feedback circuit is connected to the first input terminal of the energy dissipation control circuit. One end of the sixth resistor R6 is connected to the first connection terminal of the subsequent current sampling feedback circuit, and the other end is connected to the second connection terminal of the subsequent current sampling feedback circuit. The subsequent voltage feedback circuit 4 includes a first connection terminal, a second connection terminal, and an eleventh resistor R11. The first connection terminal of the subsequent voltage feedback circuit is connected to the common connection terminal, and the second connection terminal of the subsequent voltage feedback circuit is connected to the first input terminal of the energy dissipation control circuit. One end of the eleventh resistor R11 is connected to the first connection terminal of the subsequent voltage feedback circuit, and the other end is connected to the second connection terminal of the subsequent voltage feedback circuit.

[0089] Please refer to Figure 4 and Figure 5 The diagrams show circuit connections for a power discharge control device when the reference ground of the power storage power supply is positive, as illustrated in one embodiment. The enable signal control circuit 7 includes an optocoupler U4, a sixteenth resistor R16, and a seventeenth resistor R17. The optocoupler U4 is used for opto-isolation of the discharge start signal and the enable signal En-N. The optocoupler U4 includes a first input connection terminal, a second input connection terminal, a first isolated output terminal, and a second isolated output terminal. The first input connection terminal of the optocoupler U4 serves as the input terminal for the enable signal En-N, and the second input connection terminal is connected to the reference ground of the enable signal En-N. One end of the sixteenth resistor R16 is connected to the positive input terminal of the first operational amplifier U1, and the other end is connected to the first isolated output terminal of the optocoupler U4. One end of the seventeenth resistor R17 is used for inputting a preset second control signal V+, and the other end is connected to the second isolated output terminal of the optocoupler U4. In one embodiment, the front-end power supply connection terminal V... IN + or the connection terminal of the downstream power-consuming load V OUT + is the reference ground for the energy storage power supply. In one embodiment, the first connection terminal of the reference voltage setting circuit is used as the reference voltage signal +V. ref The input terminal. In one embodiment, the discharge transistor Q1 is a PMOS transistor.

[0090] To facilitate understanding of the operation of each functional circuit in the energy discharge control device disclosed in the embodiments of this application, the following is a description through specific embodiments, including:

[0091] The energy discharge control device disclosed in this embodiment is designed for application scenarios requiring long-term access to the discharge function. When the power circuit has no output load, i.e., the "current sampling of the subsequent current sampling feedback circuit" is zero, the energy storage capacitor C0 to be discharged can only be discharged through the internal "discharge device and current sampling (discharge resistor R)". sThe internal discharge device (and current sampling transistor Q1) is used to discharge stored electrical energy. When the power supply circuit has an output load, the internal discharge device and current sampling transistor can be reduced or even turned off accordingly. The discharge control circuit receives signals including the downstream current sampling feedback signal, the downstream voltage feedback signal, the reference voltage signal, and the discharge current sampling feedback signal to control the current flowing through the discharge device. Figure 2 As shown, the enable signal En_N is an enable signal from the "detection circuit or other enable requirements". When the enable signal En_N is low, the enable is active and the power discharge control device starts working. When the enable signal En_N is high, the enable is deactivated and the power discharge control device stops working.

[0092] In this embodiment of the application, the energy storage power supply V is considered. IN There are two different reference grounds: one is the connection terminal V of the pre-amplifier power supply. IN -or the downstream power-consuming load connection terminal V OUT - (Negative terminal) is the reference ground of the energy storage power source (e.g., ... Figure 2 and Figure 3 The circuit shown is one type, with the pre-amplifier power supply connection terminal V. IN + or the connection terminal of the downstream power-consuming load V OUT + (positive terminal) is the reference ground of the energy storage power source (e.g., ... Figure 4 and Figure 5 The circuit shown.

[0093] Let's start with... Figure 2 Taking the power storage power supply with the ground as negative as shown, the discharge transistor Q1 bears most of the discharge power, and the discharge resistor R... s It handles a small portion of the discharged power. When the enable signal En_N is low, the optocoupler U2 is turned off, and the seventeenth resistor R17 and the sixteenth resistor R16 are effectively non-existent. The power discharge control device starts working normally, and the enable is active. When the enable signal En_N is high, the optocoupler U3 is turned on. The preset first control signal V- negative voltage is forced to pull the positive input terminal of the first operational amplifier U1 to a negative level through the seventeenth resistor R17 and the sixteenth resistor R16. The first operational amplifier U1 forces a negative output voltage to turn off the discharge transistor Q1. The power discharge control device cannot work, and the enable is turned off.

[0094] When enabled, the positive input terminal of the first operational amplifier U1 is grounded or at a near-zero level, forming an adder. The positive level current feedback signal from the current sampling feedback circuit is input to the negative input terminal of the first operational amplifier U1, which is the negative reference voltage signal -V. refThe negative reference level is connected to the negative input terminal of the first operational amplifier U1 via the eighteenth resistor R18. By adjusting the conduction level of the discharge transistor Q1 through the first operational amplifier U1, the discharge current sampling feedback signal (positive level) fed back by the discharge current sampling feedback circuit is adjusted to a stable value, thereby achieving a constant discharge current and realizing preliminary power limitation, which allows setting the maximum allowable current value.

[0095] During the initial stage of discharge, the voltage of the energy storage capacitor C0 is at its highest and its power is at its maximum, so the discharge current should be limited. In the middle and later stages, the voltage of the energy storage capacitor C0 drops, and the power does not reach the allowable value. At this time, the discharge current can be increased to accelerate the discharge process. The voltage feedback signal fed back through the subsequent voltage feedback circuit is at the same positive level as the "discharge current sampling feedback signal". It is input to the negative input terminal of the first operational amplifier U1, which can offset the discharge current to a certain extent, thereby limiting the discharge current when the subsequent voltage is high and increasing the discharge current when the subsequent voltage is low.

[0096] If the energy storage power supply V IN Without output load, the discharge circuit should function normally; if there is a potential power supply V IN When the output is under load, the discharge circuit can accordingly reduce or even turn off the discharge transistor Q1, thereby reducing power consumption and improving energy efficiency. Similarly, the current feedback signal fed back through the subsequent current feedback circuit is at the same positive level as the "discharge sampling feedback signal". It is input to the negative input terminal of the first operational amplifier U1, which can offset the discharge current to a certain extent, thereby limiting the discharge current when the subsequent current is high and increasing the discharge current when the subsequent current is low.

[0097] The following is a detailed setting Figure 2 The energy discharge process of the energy discharge control device disclosed in this application embodiment is described by the electrical parameter values ​​of the circuit, specifically including:

[0098] First, set the maximum current limit.

[0099] Preset reference voltage signal -V ref The voltage is -2.5V, the maximum discharge current is 0.25A, and the discharge resistor R... s The resistance is 1Ω, R3=R5=10K, R18=100K, and the fuse can be a resettable fuse such as 0.4A. Let the discharge current be I. According to Kirchhoff's current law, we have:

[0100] I*1Ω / R3+(-Vref / R18)=0.

[0101] Next, a subsequent voltage feedback circuit is introduced.

[0102] The feedback voltage signal from the subsequent stage is first reduced by a certain factor and converted from differential to single-ended to obtain a positive level, which is then introduced to the negative input terminal of the first operational amplifier U1 via R11. The factor is set to 1 / 10, i.e., R12=R15=100K, R14=R13=10K. The storage voltage is defined as V. out The range is 0V~30V. Let R11 = xK, then we have:

[0103] (I*1Ω) / 10K+(-2.5V) / 100K+(Vout / 10) / xK=0;

[0104] After simplification, we get:

[0105] I = (-Vout / x + 0.25V) / 1Ω;

[0106] The discharge power is:

[0107] P=Vout*I=-Vout*(Vout / x-0.25V) / 1Ω;

[0108] The above equation is a quadratic equation for P with respect to Vout. P = 0 when Vout = 0 or Vout = x * 0.25V, and reaches its maximum value when Vout = x * 0.125V. Considering that discharge capability is also required even when Vout is slightly greater than 30V, i.e., x * 0.25V must be slightly greater than 30V, we design x = 130, i.e., R3 = 130K, resulting in x * 0.25V = 32.5V. When Vout = 16.25V, P reaches its maximum value of 2.03125W. Therefore, the formula for obtaining the discharge current is:

[0109] (I*1Ω) / 10K+(-2.5V) / 100K+(Vout / 10) / 130K=0;

[0110] After simplification, we get:

[0111] I = (-Vout / 130 + 0.25V) / 1Ω;

[0112] Then, a subsequent current feedback circuit is introduced.

[0113] Setting the load current of the subsequent stage to twice the value can offset the internal discharge current of one time, achieving the same or faster voltage drop rate. The current sampling resistor R0 is set to 0.01Ω. The voltage difference across it is first amplified by a certain factor and converted from differential to single-ended to obtain a positive level, which is then introduced to the negative input terminal of the first operational amplifier U1 via R6. The factor is set to 100 times, i.e., R7=R10=1K, R8=R9=100K. The output current of the subsequent stage is set to Iout. From "twice", we get 2*I*0.01Ω*100 / R6=I*1Ω / 10K, meaning R6 needs to be designed to be 20K. Therefore:

[0114] (I*1Ω) / 10K+(-2.5V) / 100K+(Vout / 10) / 130K+(Iout*0.01Ω*100) / 20K=0;

[0115] Finally, precise dynamic adjustment is achieved.

[0116] By activating precise voltage and current feedback circuits in the subsequent stages, accurate voltage and current information is acquired. A differential-to-single-ended operational amplifier is used to scale the data to a more suitable range, reducing interference with the original circuit. Furthermore, a precise discharge current sampling feedback and selection mechanism is designed; the accurate characterization of the discharge current is determined by the discharge resistor R. s The differential signal at both ends has a bleed resistor R s The high potential terminal is introduced to the negative input terminal of the first operational amplifier U1 through R3=10K, and a bleed resistor R is also required. s The low potential is introduced to the positive input terminal of the first operational amplifier U1 through R5 = 10K, and is connected to ground through R4. Define the voltage between the positive and negative terminals of the first operational amplifier U1 as y, and the bleed resistor R... s If the low potential terminal voltage is z, then:

[0117] z / y=(10K+R4) / R4=1+10K / R4;

[0118] The formula can be obtained as follows:

[0119] (I*1Ω+zy) / 10K+(-2.5Vy) / 100K+(Vout / 10-y) / 130K+(Iout*0.01Ω*100-y) / 20K=0

[0120] If we determine the value of R4, then we have:

[0121] (zy) / 10K+(-y) / 100K+(-y) / 130K+(-y) / 20K=0;

[0122] That is, z / y = 1 + 1 / 10 + 1 / 13 + 1 / 2;

[0123] We can obtain:

[0124] R4=1⁄((1 / 100K+1 / 130K+1 / 20K));

[0125] That is, R5 = 100K / / 130K / / 20K, and R4 ≈ 14.773K, then:

[0126] (I*1Ω) / 10K+(-2.5V) / 100K+(Vout / 10) / 130K+(Iout*0.01Ω*100) / 20K=0;

[0127] After setting the connection and values ​​of R5 and R4 according to the above steps, the actual circuit obtained can be accurately expressed and described by the above formula.

[0128] Next, let's take... Figure 4 Taking the positive reference ground of the power storage power supply as an example, the discharge transistor Q1 bears most of the discharge power, and the discharge resistor R... s It handles a small portion of the discharge power. When the enable signal En_N is low, the optocoupler U2 is turned off, and the seventeenth resistor R17 and the sixteenth resistor R16 are effectively non-existent. The power discharge control device starts working normally, and the enable is active. When the enable signal En_N is high, the optocoupler U3 is turned on. The preset second control signal V+ positive voltage forces the positive input terminal of the first operational amplifier U1 to a positive level through the seventeenth resistor R17 and the sixteenth resistor R16. The first operational amplifier U1 forces a positive output voltage to turn off the discharge transistor Q1. The power discharge control device cannot work, and the enable is turned off.

[0129] When enabled, the positive input terminal of the first operational amplifier U1 is grounded or at a near-zero level, forming an adder. The discharge current sampling feedback signal (negative level) from the discharge current sampling feedback circuit is input to the negative input terminal of the first operational amplifier U1, while the positive reference voltage signal +V... ref The positive reference level is connected to the negative input terminal of the first operational amplifier U1 via the eighteenth resistor R18. By adjusting the conduction level of the discharge transistor Q1 through the first operational amplifier U1, the discharge current sampling feedback signal (negative level) fed back by the discharge current sampling feedback circuit is adjusted to a stable value, thereby achieving a constant discharge current and realizing preliminary power limitation, which allows setting the maximum allowable current value.

[0130] During the initial stage of discharge, the voltage of the energy storage capacitor C0 is at its highest and its power is at its maximum, so the discharge current should be limited. In the middle and later stages, the voltage of the energy storage capacitor C0 drops, and the power does not reach the allowable value. At this time, the discharge current can be increased to accelerate the discharge process. The voltage feedback signal fed back through the subsequent voltage feedback circuit is the same negative level as the "discharge current sampling feedback signal". It is input to the negative input terminal of the first operational amplifier U1, which can offset the discharge current to a certain extent, thereby limiting the discharge current when the subsequent voltage is high and increasing the discharge current when the subsequent voltage is low.

[0131] If the energy storage power supply V IN Without output load, the discharge circuit should function normally; if there is a potential power supply V INWhen the output is under load, the discharge circuit can accordingly reduce or even turn off the discharge transistor Q1, thereby reducing power consumption and improving energy efficiency. Similarly, the current feedback signal fed back through the subsequent current feedback circuit is the same negative level as the "discharge sampling feedback signal". It is input to the negative input terminal of the first operational amplifier U1, which can offset the discharge current to a certain extent, thereby limiting the discharge current when the subsequent current is high and increasing the discharge current when the subsequent current is low.

[0132] The following is a detailed setting Figure 4 The energy discharge process of the energy discharge control device disclosed in this application embodiment is described by the electrical parameter values ​​of the circuit, specifically including:

[0133] The maximum voltage of the power supply is 30V. Due to device limitations and heat dissipation conditions, the maximum discharge power is approximately 2W, requiring rapid discharge after the power supply is de-energized. When enabled, the positive terminal of operational amplifier U21 is grounded or its level is approximately zero; this is temporarily considered as zero. The reference ground is at the positive input terminal of the power supply, and both ends of the sampling resistor R0 are considered approximately as reference ground.

[0134] First, set the maximum current limit.

[0135] Preset reference voltage signal +V ref The voltage is +2.5V, the maximum discharge current is 0.25A, and the discharge resistor R... s The resistance is 1Ω, R3=R5=10K, R18=100K, and the fuse can be a resettable fuse such as 0.4A. Let the discharge current be I. According to Kirchhoff's current law, we have:

[0136] -I*1Ω / R3+Vref / R18=0.

[0137] Next, a subsequent voltage feedback circuit is introduced.

[0138] The feedback voltage signal from the subsequent stage is first reduced by a certain factor and converted from differential to single-ended to obtain a negative level, which is then introduced to the negative input terminal of the first operational amplifier U1 via R11. The factor is set to 1 / 10, i.e., R12=R15=100K, R14=R13=10K. The power supply voltage (voltage of energy storage capacitor C0) is defined as Vout, and R11=xK, then:

[0139] (-I*1Ω) / 10K+2.5V / 100K+(-Vout / 10) / xK=0;

[0140] Simplifying the above equation, we get:

[0141] I = (-Vout / x + 0.25V) / 1Ω;

[0142] The discharge power is:

[0143] P=Vout*I=-Vout*(Vout / x-0.25V) / 1Ω;

[0144] The above equation is a quadratic equation of P with respect to Vout. P = 0 when Vout = 0 or Vout = x * 0.25V, and reaches its maximum value when Vout = x * 0.125V. Considering that there should still be discharge capability even when Vout is slightly greater than 30V, i.e., x * 0.25V should be slightly greater than 30V, we design x = 130, i.e., R3 = 130K, resulting in x * 0.25V = 32.5V. When Vout = 16.25V, P reaches its maximum value of 2.03125W, therefore:

[0145] (-I*1Ω) / 10K+2.5V / 100K+(-Vout / 10) / 130K=0;

[0146] Simplifying the above equation, we get:

[0147] I = (-Vout / 130 + 0.25V) / 1Ω;

[0148] Then, a subsequent current feedback circuit is introduced.

[0149] Setting the load current of the subsequent stage to twice the value can offset the internal discharge current of one time, achieving the same or faster voltage drop rate. The current sampling resistor R0 is set to 0.01Ω. The voltage difference across it is first amplified by a certain factor and converted from differential to single-ended to obtain a positive level, which is then introduced to the negative input terminal of the first operational amplifier U1 via R6. The factor is set to 100 times, i.e., R7=R10=1K, R8=R9=100K. The output current of the subsequent stage is set to Iout. From "twice", we get 2*I*0.01Ω*100 / R6=I*1Ω / 10K, meaning R6 needs to be designed to be 20K. Therefore:

[0150] (-I*1Ω) / 10K+2.5V / 100K+(-Vout / 10) / 130K+(-Iout*0.01Ω*100) / 20K=0;

[0151] Finally, precise dynamic adjustment is achieved.

[0152] By activating precise voltage and current feedback circuits in the subsequent stages, accurate voltage and current information is acquired. A differential-to-single-ended operational amplifier is used to scale the data to a more suitable range, reducing interference with the original circuit. A precise discharge current sampling feedback and selection mechanism is designed; the accurate characterization of the discharge current is determined by the discharge resistor R. s The differential signal at both ends has a bleed resistor R s The high potential terminal is introduced to the negative input terminal of the first operational amplifier U1 through R3=10K, and a bleed resistor R is also required. sThe low potential is introduced to the positive input terminal of the first operational amplifier U1 through R5 = 10K, and is connected to ground through R4. Define the voltage between the positive and negative terminals of the first operational amplifier U1 as y, and the bleed resistor R... s If the low potential terminal voltage is z, then:

[0153] z / y=(10K+R13) / R13=1+10K / R13;

[0154] The formula can be obtained as follows:

[0155] (-I*1Ω+zy) / 10K+(2.5Vy) / 100K+(-Vout / 10-y) / 130K+(-Iout*0.01Ω*100-y) / 20K=0

[0156] If we determine the value of R4, then we have:

[0157] (zy) / 10K+(-y) / 100K+(-y) / 130K+(-y) / 20K=0;

[0158] That is, z / y = 1 + 1 / 10 + 1 / 13 + 1 / 2;

[0159] We can obtain:

[0160] R4=1⁄((1 / 100K+1 / 130K+1 / 20K));

[0161] That is, R5 = 100K / / 130K / / 20K;

[0162] R4≈14.773K.

[0163] After determining the value of R4, we have:

[0164] (-I*1Ω) / 10K+2.5V / 100K+(-Vout / 10) / 130K+(-Iout*0.01Ω*100) / 20K=0;

[0165] As shown in the steps above, the actual circuit can be accurately described by the formula after the approximate result is obtained through the final precise adjustment and proper connection and value selection of R4 and R5.

[0166] In summary, the implementation methods using the negative terminal of the power supply as the reference ground and the positive terminal of the power supply as the reference ground are similar. The main difference lies in the positive and negative voltages. The resulting formulas are equivalent. After determining the value of R4 for each, the calculation formulas are as follows:

[0167] (I*1Ω) / 10K+(-2.5V) / 100K+(Vout / 10) / 130K+(Iout*0.01Ω*100) / 20K=0;

[0168] (-I*1Ω) / 10K+2.5V / 100K+(-Vout / 10) / 130K+(-Iout*0.01Ω*100) / 20K=0;

[0169] They are completely equivalent, and the formula can be regarded as a binary equation of instantaneous discharge current I with respect to the voltage Vout of the energy storage capacitor C0 and the output current Iout of the subsequent stage.

[0170] Please refer to Figure 6 The diagram illustrates the relationship between instantaneous discharge current, subsequent output current, and storage voltage in one embodiment. The relevant function is current(instantaneous discharge current I) = 0.25 - Vout / 130 - Iout / 2. It can be seen that when Iout = 0 and Vout is close to 0V, Iout reaches its maximum value of 0.25A.

[0171] Please refer to Figure 7 The diagram shows the instantaneous discharge power, subsequent output current, and storage voltage in one embodiment. The instantaneous discharge power P = Vout * I, where P is a binary equation for Vout and Iout. When Iout = 0 and Vout = 16.25V, P reaches its maximum value of 2.03125W.

[0172] The following section compares the differences and advantages of the energy discharge control device disclosed in this application with other discharge methods (constant resistance scheme and constant current scheme) in terms of three aspects: discharge of residual voltage (discharge time required), discharge current, and discharge power.

[0173] Please refer to Figure 8 , 9 Figures 10 and 10 are time curves comparing the residual voltage, discharge current, and discharge power, respectively. V0, I0, and P0 represent the time curves of the residual voltage, discharge current, and discharge power of the power discharge control device disclosed in this application. V1, I1, and P1 represent the time curves of the residual voltage, discharge current, and discharge power using the constant resistance scheme. V2, I2, and P2 represent the time curves of the residual voltage, discharge current, and discharge power using the constant current scheme.

[0174] 1. Energy discharge is performed using the energy discharge control device disclosed in this application.

[0175] When Iout=0, the capacitance of the energy storage capacitor C0 is 1000uF. The stored energy discharges from 30V to approximately 0V, with the same maximum allowable power of 2.03125W. The discharge starts at v=30V and t=0s.

[0176] The differential equation for the energy storage capacitor C0 is:

[0177] I = 1000uF * dv / dt;

[0178] Furthermore, the current is negative when the capacitor discharges, v∈[0V,30V].

[0179] Based on the time curves of the residual voltage V0, discharge current I0, and discharge power P0 of the power discharge control device disclosed in the embodiments of this application, since Iout=0, the above formula can be simplified to:

[0180] I0*1Ω-2.5V / 10+V0 / 130=0;

[0181] Right now:

[0182] I0 = (0.25V - V0 / 130) / 1Ω.

[0183] From the differential equation, we get:

[0184] 1000uF*dv / dt=-(0.25V-V0 / 130) / 1Ω;

[0185] Integrating, we get t = 0.13ln|65-2V0| + Cx;

[0186] Where Cx is a constant. In one embodiment, substituting the starting point, we get Cx = -0.13ln5.

[0187] When V0 = 0V, we get t = 0.13ln13 ≈ 0.333s.

[0188] From the relationship between t and V0, and considering that V0 will remain at 0V after discharging to 0, we get:

[0189] V0=MAX(32.5-2.5*e^(t / 0.13),0);

[0190] I0=0.25-(32.5-2.5*e^(t / 0.13)) / 130;

[0191] t≤0.13ln13≈0.333s;

[0192] P0=0.25*(32.5-2.5*e^(t / 0.13))-((32.5-2.5*e^(t / 0.13))^2) / 130;

[0193] t≤0.13ln13≈0.333s;

[0194] 2. A constant resistance scheme is used for energy dissipation.

[0195] Based on the time curves of the remaining voltage V1, discharge current I1, and discharge power P1, to achieve the fastest speed, the minimum resistance value must be selected, which leads to:

[0196] Rmin=30V*30V / 2.03125W≈443.077Ω;

[0197] Choose 443Ω, the discharge current is I1=V1 / 443Ω.

[0198] From the differential equation, we get:

[0199] 1000uF*dv / dt=-V1 / 443Ω;

[0200] Integrating, we get t = -0.443ln|V1| + Cx, where Cx is a constant. Substituting this into the starting point, we get Cx = 0.443ln30.

[0201] Let V1 be 0V and t approach infinity. We assume that 0.1V is the end point of the discharge. When V1 = 0.1V, we get t = 0.443ln300 ≈ 2.527s.

[0202] Therefore, the relationship between t and V1 is:

[0203] V1 = 30e^(-t / 0.443);

[0204] I1 = 30e^(-t / 0.443) / 443;

[0205] P1=1(30e^(-t / 0.443))² / 443.

[0206] 3. A constant current scheme is used for energy release.

[0207] Based on the time curves of the remaining voltage V2, discharge current I2, and discharge power P2, to achieve the fastest speed, the maximum current value needs to be selected, which means:

[0208] Imax = 2.03125W / 30V ≈ 0.0677A, choose 0.068A, the discharge current is I2 = 0.068A.

[0209] From the differential equation, we get:

[0210] 1000uF*dv / dt=-0.068A, integrating gives t=-V2 / 68+Cx, where Cx is a constant, substituting into the starting point gives Cx=15 / 34.

[0211] When V2 = 0V, we get t = 15 / 34 ≈ 0.441s. From this, we can deduce the relationship between t and V2, and since V2 will remain at 0V after discharging to 0, we have:

[0212] V2 = MAX(-68t + 30, 0);

[0213] I2=0.068A, t≤15 / 34≈0.441s;

[0214] P2=(-68t+30)*0.068, t≤15 / 34≈0.441s.

[0215] Depend on Figure 8 , Figure 9 and Figure 10 As shown, the time required for the remaining voltage to reach zero indicates that, under the same scenario and power constraints, the energy discharge scheme disclosed in this application requires 0.333s, which is better than the existing constant current scheme's 0.441s, and far superior to the existing constant resistance scheme. The discharge current and power curves show that the energy discharge control device disclosed in this application maximizes the discharge current and power as much as possible under limited power conditions, thereby achieving a faster overall discharge speed.

[0216] It should be noted that, under the condition of limited power Pmax, the fastest discharge scheme is to control the discharge current to I=Pmax / Vout. This requires the use of a dedicated chip (usually a multiplier chip) to build a divider, or the intervention of a main control unit (such as an MCU / FPGA), which increases the circuit cost and the response speed of feedback regulation will be slower than that of operational amplifiers and analog devices. Furthermore, regarding the implementation of enable control, in addition to the optocoupler scheme summarized in the embodiments of this application, there are many other implementation schemes. The subsequent voltage feedback circuit and the subsequent current feedback circuit can also adopt other differential-to-single-ended conversion methods, which are not the focus of this invention and will not be elaborated here.

[0217] The energy discharge control device disclosed in this application includes an energy storage circuit, a discharge circuit, a reference voltage setting circuit, a discharge current sampling feedback circuit, and an energy discharge control circuit. The energy storage circuit uses an energy storage device to store stored potential energy. The discharge circuit releases the stored potential energy through a discharge resistor and a discharge transistor connected in series. The reference voltage setting circuit outputs a reference voltage signal. The discharge current sampling feedback circuit outputs a discharge current sampling feedback signal based on the discharge current sampled from the discharge resistor. The energy discharge control circuit controls the conduction level of the discharge transistor based on the reference voltage signal and the discharge current sampling feedback signal. Because the discharge current sampling feedback signal output by the discharge current sampling feedback circuit dynamically controls the conduction level of the discharge transistor, it dynamically adapts to changes in the stored potential energy of the energy storage device, making the discharge power of the discharge circuit stable and controllable, and achieving a faster discharge rate while maintaining a constant discharge power.

[0218] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. An electrical energy discharge control device, characterized by, The energy storage circuit comprises an energy storage device for storing potential energy; The reference voltage setting circuit is used for outputting a reference voltage signal with a preset voltage value; a bleeder circuit comprising a bleeder resistor R connected in series s and a bleeder transistor Q1 connected in parallel with the energy storage device of the energy storage circuit for discharging the energy storage device through the bleeder transistor Q1 and the bleeder resistor R when the bleeder transistor Q1 is turned on s releasing the stored energy of the energy storage device; The energy discharge control circuit is connected with the control electrode of the discharge transistor Q1, and is used for controlling the conduction degree of the discharge transistor Q1 according to the reference voltage signal and the discharge current feedback signal, so as to dynamically control the discharge current of the discharge circuit. A bleeder current sampling feedback circuit is configured to sample a bleeder current flowing through the bleeder resistor R s when the bleeder transistor Q1 is turned on, and output a bleeder current sampling feedback electrical signal according to the obtained bleeder sampling current, wherein a voltage value of the bleeder current sampling feedback electrical signal is positively correlated with a current value of the bleeder current. Further comprising:

2. The electrical energy bleed control device of claim 1, wherein, The post-stage voltage feedback circuit is used for monitoring the potential voltage of the energy storage device, and outputting a post-stage voltage feedback signal according to the potential voltage; The energy discharge control circuit is used for controlling the conduction degree of the discharge transistor Q1 according to the post-stage voltage feedback signal, the reference voltage signal and the discharge current feedback signal. The energy storage device is an energy storage capacitor C0; the energy storage circuit further comprises a current sampling resistor R0; the current sampling resistor R0 is connected in series with the energy storage capacitor C0; 3. The electrical energy bleed control device of claim 2, wherein, The energy discharge control device further comprises: The post-stage current sampling feedback circuit is used for sampling the post-stage current flowing through the current sampling resistor R0, and outputting a post-stage current sampling feedback signal according to the obtained post-stage sampling current; The energy discharge control circuit is used for controlling the conduction degree of the discharge transistor Q1 according to the post-stage current sampling feedback signal, the post-stage voltage feedback signal, the reference voltage signal and the discharge current feedback signal. The energy storage circuit further comprises a post-stage connection end, a pre-stage connection end and a common connection end; 4. The electrical energy bleed control device of claim 3, wherein, The bleeder circuit further comprises a fuse FUSE connected in series with the bleeder resistor R s and the bleeder transistor Q1.

5. The electrical energy bleed control device of claim 3, wherein, The current sampling resistor R0 is connected in series with the energy storage capacitor C0, one end of the series connection of the current sampling resistor R0 and the energy storage capacitor C0 is used as the post-stage connection end, the other end of the series connection of the current sampling resistor R0 and the energy storage capacitor C0 is used as the common connection end, and the connection end of the current sampling resistor R0 and the energy storage capacitor C0 is used as the pre-stage connection end; the pre-stage connection end and the common connection end are used as the pre-stage power supply connection end for storing energy in the energy storage capacitor C0, and the post-stage connection end and the common connection end are used as the post-stage load connection end for discharging the potential energy of the energy storage capacitor C0; The energy discharge control circuit comprises a first operational amplifier U1, a first resistor R1, a second resistor R2, a first output end, a first input end and a second input end; The bleed transistor Q1 further comprises a first connecting pole and a second connecting pole; the first connecting pole of the bleed transistor Q1 is electrically connected with the common connecting end, and the second connecting pole of the bleed transistor Q1 is electrically connected with one end of the bleed resistor R s , and the other end of the bleed resistor R s is electrically connected with the front-stage connecting end.

6. The electrical energy bleed control device of claim 5, wherein, The first output end of the energy discharge control circuit is connected with the control electrode of the discharge transistor Q1, the first input end of the energy discharge control circuit is connected with the reference voltage setting circuit, and the second input end of the energy discharge control circuit is connected with the discharge current feedback circuit; One end of the first resistor R1 is connected with the output end of the first operational amplifier U1, and the other end is connected with the first output end of the energy discharge control circuit; One end of the second resistor R2 is connected with the first input end of the energy discharge control circuit, and the other end is connected with the negative input end of the first operational amplifier U1; The positive input end of the first operational amplifier U1 is used as the second input end of the energy discharge control circuit. The discharge current feedback circuit comprises a first connection end, a second connection end, a third connection end, a third resistor R3 and a fourth resistor R4; 7. The electrical energy bleed control device of claim 6, wherein, ​ The first connection end of the bleed current feedback circuit is connected with the second connection pole of the bleed transistor Q1; The second connection end of the bleed current feedback circuit is connected with the first input end of the energy bleed control circuit; The third connection end of the bleed current feedback circuit is connected with the second input end of the energy bleed control circuit; One end of the third resistor R3 is connected with the first connection end of the bleed current feedback circuit, and the other end is connected with the second connection end of the bleed current feedback circuit; One end of the fourth resistor R4 is connected with the third connection end of the bleed current feedback circuit, and the other end is grounded; Or, the bleed current feedback circuit comprises a first connection end, a second connection end, a third connection end, a fourth connection end, a third resistor R3, a fourth resistor R4 and a fifth resistor R5; The first connection end of the bleed current feedback circuit is connected with the second connection pole of the bleed transistor Q1; The second connection end of the bleed current feedback circuit is connected with the first input end of the energy bleed control circuit; The third connection end of the bleed current feedback circuit is connected with the second input end of the energy bleed control circuit; The fourth connection end of the bleed current feedback circuit is connected with the front-stage connection end; One end of the third resistor R3 is connected with the first connection end of the bleed current feedback circuit, and the other end is connected with the second connection end of the bleed current feedback circuit; One end of the fourth resistor R4 is connected with the third connection end of the bleed current feedback circuit, and the other end is grounded; One end of the fifth resistor R5 is connected with the third connection end of the bleed current feedback circuit, and the other end is connected with the fourth connection end of the bleed current feedback circuit.

8. The electrical energy bleed control device of claim 6, wherein, The rear-stage current feedback circuit comprises a first connection end, a second connection end and a sixth resistor R6; The first connection end of the rear-stage current feedback circuit is connected with the rear-stage connection end, and the second connection end of the rear-stage current feedback circuit is connected with the first input end of the energy bleed control circuit; One end of the sixth resistor R6 is connected with the first connection end of the rear-stage current feedback circuit, and the other end is connected with the second connection end of the rear-stage current feedback circuit; Or, the rear-stage current feedback circuit comprises a first connection end, a second connection end, a third connection end, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and a second operational amplifier U2; The first connection end of the rear-stage current feedback circuit is connected with the rear-stage connection end, the second connection end of the rear-stage current feedback circuit is connected with the first input end of the energy bleed control circuit, and the third connection end of the rear-stage current feedback circuit is connected with the front-stage connection end; One end of the sixth resistor R6 is connected with the second connection end of the rear-stage current feedback circuit, and the other end is connected with the output end of the second operational amplifier U2; One end of the seventh resistor R7 is connected with the negative input end of the second operational amplifier U2, and the other end is connected with the third connection end of the rear-stage current feedback circuit; One end of the eighth resistor R8 is connected with the positive input end of the second operational amplifier U2, and the other end is grounded; One end of the ninth resistor R9 is connected with the negative input end of the second operational amplifier U2, and the other end is connected with the output end of the second operational amplifier U2; One end of the tenth resistor R10 is connected with the first connection end of the rear-stage sampling current feedback circuit, and the other end is connected with the positive input end of the second operational amplifier U2.

9. The electrical energy bleed control device of claim 6, wherein, The rear-stage voltage feedback circuit comprises a first connection end, a second connection end and an eleventh resistor R11; The first connection end of the rear-stage voltage feedback circuit is connected with the common connection end, and the second connection end of the rear-stage voltage feedback circuit is connected with the first input end of the energy release control circuit; One end of the eleventh resistor R11 is connected with the first connection end of the rear-stage voltage feedback circuit, and the other end is connected with the second connection end of the rear-stage voltage feedback circuit; Or, the rear-stage voltage feedback circuit comprises a first connection end, a second connection end, a third connection end, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15 and a third operational amplifier U3; The first connection end of the rear-stage voltage feedback circuit is connected with the common connection end, the second connection end of the rear-stage voltage feedback circuit is connected with the first input end of the energy release control circuit, and the third connection end of the rear-stage voltage feedback circuit is connected with the rear-stage connection end; One end of the eleventh resistor R11 is connected with the second connection end of the rear-stage voltage feedback circuit, and the other end is connected with the output end of the third operational amplifier U3; One end of the twelfth resistor R12 is connected with the negative input end of the third operational amplifier U3, and the other end is connected with the third connection end of the rear-stage voltage feedback circuit; One end of the thirteenth resistor R13 is connected with the positive input end of the third operational amplifier U3, and the other end is grounded; One end of the fourteenth resistor R14 is connected with the negative input end of the third operational amplifier U3, and the other end is connected with the output end of the third operational amplifier U3; One end of the fifteenth resistor R15 is connected with the first connection end of the rear-stage voltage feedback circuit, and the other end is connected with the positive input end of the third operational amplifier U3.

10. The electrical energy bleed control device of claim 1, wherein, Further comprising: An enable signal control circuit is used for outputting a release start electric signal to the energy release control circuit in response to a preset enable signal En-N, so that the energy release control circuit controls the conduction of the release transistor Q1 in response to the release start electric signal; the enable signal control circuit comprises an optoelectronic coupler, which is used for optoelectronically isolating the release start electric signal and the enable signal En-N.

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