Discharge control circuit, method and power supply device

Abstract

The application provides a discharge control circuit, a method and a power supply device. The discharge control circuit comprises an energy storage module, a discharge element, a first end of the discharge element being coupled to a first end of the energy storage module, a switch module, a first end of the switch module being coupled to a second end of the discharge element, a second end of the switch module being coupled to a second end of the energy storage module, and a control module, the control module being coupled to a control end of the switch module, used for controlling the switch module to be turned on, and discharging the energy storage module through the discharge element. During the discharging process, the control module acquires an energy accumulation value of the discharge element and / or a discharging time, adjusts the control on the switch module according to the energy accumulation value and / or the discharging time, and reduces the energy accumulation value of the discharge element. In this way, the limitation on the energy accumulation value and / or the discharging time is adjusted, the heat accumulation in the discharging process caused by repeated switching is avoided, and the normal discharge function is ensured.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the field of electronic power technology, in particular to a discharge control circuit, method and power supply device. BACKGROUND

[0002] In the current charging power supply, the output voltage of the charging power supply should be reduced to 60V (CE standard) within 1s after stopping output, and the current method is to discharge through parallel resistance at the output end. When normal output is performed, the capacitor inside the circuit supplies power to the output end; after shutdown, the voltage on the capacitor in the circuit is discharged through the parallel resistance.

[0003] However, due to the possibility of some extreme application scenarios of the system circuit, such as repeated on-off, for example, in the test power supply, compared with other conventional power supply products, users will have higher requirements for the response speed and discharge speed of the direct current test power supply. The discharge resistor can effectively help the direct current source to realize fast response, fast discharge and other functions, so that the dynamic performance of the power supply is more excellent and safer to use. However, for the above-mentioned fast discharge and other application scenarios, the burden of the discharge element may be increased, causing damage to the components and other problems, thereby causing other safety hazards. SUMMARY

[0004] The main purpose of the present application is to provide a discharge control circuit, method and power supply device to solve the problem of abnormal circuit caused by heat accumulation of discharge elements in the discharge process after repeated on-off of the circuit system, so as to optimize the discharge logic and ensure the normal discharge function through the control of energy accumulation value and discharge time.

[0005] To solve the above problems, the present application provides a discharge control circuit, method and power supply device; the discharge control circuit comprises: an energy storage module; a discharge element, a first end of the discharge element being coupled to a first end of the energy storage module; a switch module, a first end of the switch module being coupled to a second end of the discharge element, and a second end of the switch module being coupled to a second end of the energy storage module; a control module, the control module being coupled to a control end of the switch module, for controlling the switch module to be turned on, and discharging the energy storage module through the discharge element; during the discharging process, the control module acquires an energy accumulation value of the discharge element and / or a discharge time, adjusts the control of the switch module according to the energy accumulation value and / or the discharge time, and reduces the energy accumulation value of the discharge element.

[0006] In an embodiment, during the discharging process, the control module controls the switch module to be turned off in response to the energy accumulation value being greater than an energy threshold value; and / or, the control module controls the switch module to be turned off in response to the discharge time being greater than a time threshold value.

[0007] In an embodiment, the control module obtains the time threshold according to the first voltage of the energy storage module, the second voltage of the energy storage module, the capacitance value of the energy storage module and the resistance value of the discharging element, wherein the energy storage module needs to be discharged from the first voltage to the second voltage.

[0008] In an embodiment, the time threshold is obtained according to the following formula: τ = R * C * ln(V1 / V2); T ≥ n * 2τ; wherein R is the resistance value of the discharging element, C is the capacitance value of the energy storage module, V1 is the voltage value of the first voltage, V2 is the voltage value of the second voltage, τ is the time of discharging the voltage value from V1 to V2, T is the time threshold, and n is a coefficient.

[0009] In an embodiment, the control module obtains the energy threshold according to the resistance rated power of the discharging element and the multiple of the rated power.

[0010] In an embodiment, the energy threshold is obtained according to the following formula: Qw = a * Wr * A * Tt; wherein Qw is the energy threshold, a is a coefficient, Wr is the resistance rated power of the discharging element, Tt is a time parameter, and A is the multiple of the rated power that the discharging element can withstand within Tt.

[0011] In an embodiment, during the discharging process, the control module obtains the energy accumulation value according to the target voltage of the energy storage module and the resistance value of the discharging element.

[0012] In an embodiment, during the discharging process, the control module obtains the energy accumulation value according to the target voltage of the energy storage module, the resistance value of the discharging element and the energy dissipation value of the discharging element.

[0013] In an embodiment, the energy dissipation value is obtained according to the following formula: Qr = a * Wr * t; and the energy accumulation value is obtained according to the following formula: Qg = ∫0bU / R dt; wherein Qr is the energy dissipation value of the discharging element per t time unit, Wr is the rated power of the discharging element, a is a coefficient, t is a time parameter, Qg is the energy accumulation value on the discharging element from 0 time to b time, U is the voltage value applied across the discharging element, and R is the resistance value of the discharging element.

[0014] To solve the above problems, the application further provides a discharging control method applied to a discharging control circuit, the discharging control circuit comprising: a discharging element, a first end of the discharging element being coupled to a first end of an energy storage module; a switch module, a first end of the switch module being coupled to a second end of the discharging element, and a second end of the switch module being coupled to a second end of the energy storage module; and a control module, the control module being coupled to a control end of the switch module, and being configured to control the switch module to be turned on, and to discharge the energy storage module through the discharging element; the method comprising: during the discharging process, the control module obtaining an energy accumulation value of the discharging element and / or a discharging time; and the control module adjusting the control on the switch module according to the energy accumulation value and / or the discharging time, and reducing the energy accumulation value of the discharging element.​

[0015] To solve the above problems, the application further provides a power supply device comprising the discharge control circuit as described in any one of the above embodiments.

[0016] The application provides a discharge control circuit, a method and a power supply device; during the discharging process, the control module adjusts the control of the switch module according to the energy accumulation value generated by the discharging element and / or the discharging time, reduces the energy accumulation value of the discharging element, and further ensures the normal discharging function of the circuit, so as to avoid the heat accumulation of the discharging element caused by the repeated on-off discharging process, reduce the damage probability of the discharging element, and save the replacement cost of the discharging element. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort based on these drawings. Among them:

[0018] Figure 1 is a structural schematic diagram of a first embodiment of the discharge control circuit provided by the application;

[0019] Figure 2 is a structural schematic diagram of a second embodiment of the discharge control circuit provided by the application;

[0020] Figure 3 is a step flowchart of an embodiment of the discharge control method provided by the application;

[0021] Figure 4 is a structural schematic diagram of an embodiment of the power supply device provided by the application;

[0022] Figure 5 is a flowchart of an embodiment of the discharge flow scheme provided by the application.

[0023] List of drawings:

[0024] Energy storage module 10; discharging element 20; switch module 30; control module 40; resistor R1; capacitor C1; anti-reverse diode D1; discharge control circuit 100; power supply device 200. DETAILED DESCRIPTION

[0025] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the convenience of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0026] The terms "first", "second", and the like in the present application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units not listed, or optionally includes other steps or units inherent to the process, method, product or device.

[0027] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor does it necessarily refer to a particular embodiment that is "preferred" over other embodiments. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] For the current discharge mode of the circuit, only part of the scene working condition can meet the discharge, but for some more extreme or complex working conditions, the heat accumulation effect of the discharge element due to high voltage or repeated switching discharge may occur, affecting the service life of the equipment, and even causing damage to the components and causing fire safety hazards. Therefore, how to realize the discharge control of the discharge element in the circuit under multiple working conditions, effectively and reliably, is particularly important, so the present application provides a discharge control circuit, method and power supply device to solve the above problems.

[0029] Referring to Figure 1 , as shown in the drawings, Figure 1 is a structural schematic diagram of the first embodiment of the discharge control circuit provided by the present application; the discharge control circuit 100 comprises an energy storage module 10, a discharge element 20, a switching module 30 and a control module 40.

[0030] Specifically, the first end of the discharging element 20 is coupled to the first end of the energy storage module 10; the first end of the switch module 30 is coupled to the second end of the discharging element 20, and the second end of the switch module 30 is coupled to the second end of the energy storage module 10; the control module 40 is coupled to the control end of the switch module 30, used to control the switch module 30 to be turned on, so as to discharge the energy storage module 10 through the discharging element 20; during the discharging process, the control module 40 acquires the energy accumulation value of the discharging element 20 and / or the discharging time, adjusts the control of the switch module 30 according to the energy accumulation value and / or the discharging time, and reduces the energy accumulation value of the discharging element 20.

[0031] In the above scheme, the energy accumulation value of the discharging element 20 and the discharging time are adjusted, the on-off of the switch module 30 is further controlled, the energy accumulation value of the discharging element 20 is controlled, the overheat of the discharging element 20 is avoided, the performance safety of the discharging element 20 in some extreme working condition scenes or severe tests is protected, damage is avoided, and then the normal realization of the discharging function of the circuit is ensured. Figure 1 As shown in the figure, the discharging element 20 is coupled to the positive electrode of the voltage output Vout+, and the switch module 30 is coupled to the negative electrode of the voltage output Vout-, and then the external discharge is realized through the control of the switch module 30 or the discharge of the discharging element 20.

[0032] In the above scheme, the energy accumulation value of the discharging element 20 and the discharging time are adjusted, the on-off of the switch module 30 is further controlled, the energy accumulation value of the discharging element 20 is controlled, the overheat of the discharging element 20 is avoided, the performance safety of the discharging element 20 in some extreme working condition scenes or severe tests is protected, damage is avoided, and then the normal realization of the discharging function of the circuit is ensured.

[0033] In the above scheme, the energy accumulation value of the discharging element 20 and the discharging time are adjusted, the on-off of the switch module 30 is further controlled, the energy accumulation value of the discharging element 20 is controlled, the overheat of the discharging element 20 is avoided, the performance safety of the discharging element 20 in some extreme working condition scenes or severe tests is protected, damage is avoided, and then the normal realization of the discharging function of the circuit is ensured. Figure 2 As shown in the figure, Figure 2 is a structure diagram of the second embodiment of the discharging control circuit provided by the present application; in the embodiment, the discharging element 20 adopts a resistor R1, and the energy storage module 10 adopts a capacitor C1; further, the above embodiment further includes an anti-reverse diode D1 on the basis of the above embodiment, the anode end of the anti-reverse diode D1 is coupled to the first end of the discharging element 20, and the cathode end of the anti-reverse diode D1 is coupled to the positive electrode of the output voltage end; specifically, the function of the anti-reverse diode D1 is to prevent the external voltage from affecting the internal system, if the anti-reverse diode D1 is damaged or fails due to other reasons, the external voltage will be applied to the two ends of the discharging element 20 after the system is shut down, and then the rated power of the discharging element 20 is exceeded, causing damage to the discharging element 20. Through the above embodiment, the energy accumulation value of the discharging element 20 and the discharging time are detected, and the on-off of the switch module 30 is controlled and the electrical connection is opened in time, so as to avoid damage to the discharging element 20 or other components, thereby ensuring the normal discharge and the safety of the circuit, so as to avoid the influence caused by the damage of the anti-reverse diode D1.

[0034] In the above scheme, the energy accumulation value of the discharging element 20 and the discharging time are adjusted, the on-off of the switch module 30 is further controlled, the energy accumulation value of the discharging element 20 is controlled, the overheat of the discharging element 20 is avoided, the performance safety of the discharging element 20 in some extreme working condition scenes or severe tests is protected, damage is avoided, and then the normal realization of the discharging function of the circuit is ensured.

[0035] In an embodiment, during the discharging process, the control module 40 controls the switch module 30 to be disconnected in response to the energy accumulation value being greater than the energy threshold value; and / or, the control module 40 controls the switch module 30 to be disconnected in response to the discharging time being greater than the time threshold value.

[0036] In which, in relation to the energy accumulation value and the discharging time, different threshold values can be set for the limitation.

[0037] When the energy accumulation value on the discharging element 20 exceeds the set energy threshold value, the switch module 30 is controlled to be disconnected, and the discharging is stopped, so that the discharging element 20 can obtain a rest time to dissipate energy by itself.

[0038] When the energy accumulation value is reduced to less than the energy threshold value, the switch module 30 is controlled to be turned on to continue discharging.

[0039] Further, the discharging time of the discharging element 20 can be controlled. Through actual test parameters, it is known that after the discharging element 20 discharges for a period of time, the energy accumulation value of the discharging element 20 is obtained, and then the safety threshold value in a specific time is obtained, and when the discharging time is greater than the time threshold value, the switch module 30 is controlled to be disconnected and the energy dissipation of the discharging element 20 is performed, so as to realize a safe discharging process.

[0040] In the above scheme, for the control of the switch module 30, the energy accumulation value can be controlled alone, or the discharging time can be controlled alone, or the energy accumulation value and the discharging time can be controlled in combination, and the specific scheme is set according to the actual demand, which is not limited.

[0041] The specific scheme of the discharging time control is as follows:

[0042] In an embodiment, the control module 40 obtains the time threshold value according to the first voltage, the second voltage of the energy storage module 10, the capacitance value of the energy storage module 10 and the resistance value of the discharging element 20. In which, the energy storage module 10 needs to be discharged from the first voltage to the second voltage.

[0043] In which, in relation to the energy accumulation value and the discharging time, different threshold values can be set for the limitation.

[0044] In an embodiment, the time threshold value is obtained by the following formula:

[0045] T = n * 2τ; T ≥ n * 2τ;

[0046] Wherein, R is the resistance of the discharge element 20, C is the capacitance of the energy storage module 10, V1 is the voltage value of the first voltage, V2 is the voltage value of the second voltage (V1>V2), τ is the time of the voltage value from V1 to V2 discharge, T is the time threshold, n is the coefficient.

[0047] When the device circuit discharges, the discharge time is timed, and when it is detected that the discharge time exceeds the set time threshold, the switch module 30 is controlled to be disconnected to stop discharging, wherein τ is the time of the voltage value from V1 to V2 discharge, that is, the theoretical discharge time, and regarding the further setting of the time threshold, in order to ensure that the continuous discharge in the abnormal state of the system circuit will cause uncontrollable damage to the circuit, which seriously affects the safety of the equipment, therefore, on the basis of the theoretical time, the time threshold is set to limit, to ensure that the equipment discharges normally and avoid long-time discharge in abnormal conditions. The value of n can be set according to the actual situation.

[0048] Regarding the specific scheme of energy accumulation value control of the discharge element 20:

[0049] In an embodiment, the control module 40 obtains the energy threshold according to the resistance rated power and the rated power multiple of the discharge element 20.

[0050] The energy threshold that the discharge element 20 can withstand in a period of time is calculated by the resistance rated power and the rated power multiple of the discharge element 20, wherein the specific setting of the energy threshold can be set according to the physical characteristics of the discharge element 20 itself and the actual scheme requirements, and the specific scheme can be referred to as follows:

[0051] In an embodiment, the energy threshold is obtained by the following formula:

[0052] Qw = a * Wr * A * Tt;

[0053] Wherein, Qw is the energy threshold, a is the coefficient, Wr is the resistance rated power of the discharge element 20, Tt is the time parameter, and A is the rated power multiple that the discharge element 20 can withstand within Tt.

[0054] Wherein, the rated power multiple A can be obtained by inquiring the specification of the discharge element 20, and the meaning of the rated power multiple that the discharge element 20 can withstand within Tt, for example, the resistance R can withstand 50 times of the rated power within 120ms.

[0055] In one embodiment, during the discharge process, the control module 40 obtains the energy accumulation value based on the target voltage of the energy storage module 10 and the resistance value of the discharge element 20.

[0056] At the start of the discharge process, the control module 40 obtains the energy accumulation value based on the target voltage of the energy storage module 10 and the resistance value of the discharge element 20. The parameters such as the target voltage of the energy storage module 10 and the resistance value of the discharge element 20 can be adjusted according to the actual situation and the scheme to determine the number of consecutive power-on and power-off cycles, thereby meeting the application requirements in various different scenarios.

[0057] In one embodiment, during the discharge process, the control module 40 obtains the energy accumulation value based on the target voltage of the energy storage module 10, the resistance value of the discharge element 20, and the energy dissipation value of the discharge element 20.

[0058] In the two embodiments described above, this embodiment further refines the acquisition of the energy accumulation value by also involving the energy dissipation value of the discharge element 20, as detailed in the following scheme:

[0059] In one embodiment, the energy accumulation value is obtained using the following formula:

[0060] Qg= ;

[0061] Where Qr is the energy dissipated by the discharge element 20 per unit time t (i.e., the energy dissipation value), t is the time parameter, Qg is the cumulative energy value on the discharge element 20 from time 0 to time b, U is the voltage value applied across the discharge element 20 (when the switch module 30 is turned on, U is the output voltage; when the switch module 30 is turned off, U is 0), and R is the resistance value of the discharge element 20.

[0062] Understandably, at the start of the discharge process, the control module 40 calculates the energy accumulation value of the discharge element 20 in real time. While the discharge element 20 is accumulating energy, it also dissipates some energy. Therefore, the energy accumulation value of the discharge element 20 is calculated in real time by combining the energy generation and dissipation, so as to make judgments and take actions based on the energy accumulation value.

[0063] In one embodiment, the control module 40 obtains the energy dissipation value based on the rated power of the discharge element 20.

[0064] In one embodiment, the specific implementation scheme and formula for the energy dissipation value described above are as follows:

[0065] The energy dissipation value is: Qr = a * Wr * t;

[0066] Wherein, Wr is the rated power of the discharge element 20, a is a coefficient, t is a time parameter, and Qr is the energy dissipated by the discharge element 20 per unit time t.

[0067] Wherein, the parameter about t, for example, if t = 1 s (i.e., the time unit is second), then Qr is the energy dissipated by the discharge element 20 per second; if t = 1 ms, then Qr is the energy dissipated by the discharge element 20 per millisecond.

[0068] In the above process, when the energy accumulation value exceeds the energy threshold value, it indicates that the discharge element 20 at this time reaches the upper limit, and the control switch module 30 is disconnected, i.e., the discharge process is stopped.

[0069] For the subsequent, after the circuit stops discharging, the discharge element 20 at this time only dissipates energy to consume the energy value accumulated by the discharge element 20 in the discharge process; in an embodiment, when it is detected that the energy accumulation value is consumed less than a certain threshold, the switch module 30 is turned on to continue discharging.

[0070] In the above manner, in the discharge process, the control module adjusts the control of the switch module according to the energy accumulation value generated by the discharge element and / or the discharge time, reduces the energy accumulation value of the discharge element, and further ensures the normal discharge function of the circuit to avoid the heat accumulation of the discharge element caused by the repeated on-off discharge process, reduces the damage probability of the discharge element, and saves the replacement cost of the discharge element.

[0071] To solve the above problems, the present application also provides a discharge control method applied to a discharge control circuit 100, which comprises: a discharge element 20, a first end of the discharge element 20 being coupled to a first end of an energy storage module 10; a switch module 30, a first end of the switch module 30 being coupled to a second end of the discharge element 20, and a second end of the switch module 30 being coupled to a second end of the energy storage module 10; and a control module 40, the control module 40 being coupled to a control end of the switch module 30, and being configured to control the switch module 30 to be turned on to discharge the energy storage module 10 through the discharge element 20; as shown in Figure 3 Figure 3 is a step flow diagram of an embodiment of the discharge control method provided by the present application; specifically, the method comprises the following steps:

[0072] Step S10: In the discharge process, the control module 40 acquires the energy accumulation value of the discharge element 20 and / or the discharge time.

[0073] Wherein, the energy accumulation value of the discharge element 20 and / or the discharge time can be acquired by using the above-mentioned embodiment. At the beginning of the discharge process, the energy accumulation value of the discharge element 20 in the circuit is calculated, and at the same time, the discharge time is started. ​

[0074] Step S20: The control module 40 adjusts the control of the switch module 30 based on the energy accumulation value and / or discharge time to reduce the energy accumulation value of the discharge element 20.

[0075] The specific implementation scheme for adjusting the control of the switching module 30 based on the energy accumulation value and / or discharge time to reduce the energy accumulation value of the discharge element 20 can be referred to the scheme in the above embodiments, and will not be elaborated here.

[0076] To address the aforementioned problems, this application also provides a power supply device 200, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of an embodiment of the power supply device provided in this application; the power supply device 200 includes a discharge control circuit 100 as described in any of the above embodiments.

[0077] In one specific embodiment, a discharge process scheme is provided in the circuit structure of the above-described solution embodiment, such as... Figure 5 As shown, Figure 5 This is a schematic flowchart of an embodiment of the discharge process scheme provided in this application.

[0078] Step 1: First, determine whether the device is powered on: If it is powered on, set the discharge flag to 0; if it is not powered on, proceed to step 2.

[0079] Step 2: Detect whether the output voltage of the circuit is greater than or equal to 12V. If the output voltage is greater than or equal to 12V, set the discharge flag to 1; if the output voltage is less than 12V, proceed to step 3.

[0080] Step 3: Detect whether the output voltage is less than 5V. If the output voltage is less than 5V, set the discharge flag to 0; if the output voltage is greater than or equal to 5V, set the discharge flag to 1.

[0081] After completing the above determination, namely the determination in step 3 and the setting of the discharge flag, proceed to step 4.

[0082] Step 4: Determine the 1ms time base flag. If the 1ms time base flag is present, proceed to Step 5; otherwise, proceed directly to Step 7. That is, perform the determination every 1ms.

[0083] Step 5: Determine if the discharge flag is equal to 1.

[0084] In response to the discharge flag being 1, the discharge time count is incremented, and the resistance energy accumulation value Qg is calculated. It can be understood that when the discharge flag is 1, i.e. the circuit is in the discharging state, the discharge time count is gradually accumulated, and the resistance (i.e. the discharging element 20) energy accumulation value Qg corresponding to the time increment is calculated, and the energy on the discharging element 20 is gradually accumulated.

[0085] In response to the discharge flag not being equal to 1, the discharge time count is decremented, and the resistance (i.e. the discharging element 20) energy accumulation value Qg and the energy dissipation value Qr are calculated. It can be understood that when it is determined that the discharge flag is not equal to 1, the circuit stops discharging, the discharging element 20 gradually releases the energy accumulated during discharging through its own consumption, and the time count accumulated during the discharging state is also decremented synchronously, and the energy accumulation value Qg gradually decreases as the time count decreases.

[0086] After the determination and calculation operations in step 5 are completed, the current discharge time count and the energy accumulation value are determined, i.e. step 6 is performed.

[0087] Step 6: whether the discharge time count value is greater than / equal to the discharge time limit, or whether the resistance energy accumulation value Qg is greater than / equal to the discharge energy limit Qw.

[0088] In response to the discharge time count value being greater than / equal to the discharge time limit, or the resistance energy accumulation value Qg being greater than / equal to the discharge energy limit Qw, the discharge time count is cleared, and the discharge flag is set to 0; i.e. in the stop discharging state, the discharging element 20 can dissipate energy through itself to consume the previous energy accumulation.

[0089] In response to the discharge time count value being less than the discharge time limit, and the resistance energy accumulation value Qg being less than the discharge energy limit Qw, step 7 is performed.

[0090] Step 7: whether the energy accumulation value Qg is less than / equal to the discharge energy limit Qw*0.01.

[0091] In response to the energy accumulation value Qg being less than / equal to the discharge energy limit Qw*0.01, it is detected that the accumulation value on the discharging element 20 (i.e. the resistance) is less than the limit value at this time, indicating that the state is safe at this time, and the discharging operation can continue to be performed, so the discharge flag can be set to 1 to continue discharging.

[0092] In response to the energy accumulation value Qg being greater than the discharge energy limit Qw*0.01, the energy accumulation value on the discharging element at this time is still large, which does not satisfy the minimum energy accumulation value for performing the discharging operation, so it is not operated at this time, i.e. it is still in the stop discharging state, and the discharging element 20 still dissipates energy through itself.

[0093] It can be understood that, through the cyclic execution of the above steps, it can be avoided that the energy accumulation is too much in the discharging process, causing the energy accumulation to exceed the bearing value of the discharging element 20, and further causing the damage of components and even the circuit. At the same time, when it is detected that the energy accumulation value of the discharging element 20 meets the requirement of continuing discharging, the discharging can be continued. The safety of the circuit is effectively protected, and the normal execution of the discharging function is ensured.

[0094] The application provides a discharging control circuit 100, a method and a power supply device 200; the discharging control circuit 100 comprises: an energy storage module 10; a discharging element 20, a first end of the discharging element 20 being coupled to a first end of the energy storage module 10; a switching module 30, a first end of the switching module 30 being coupled to a second end of the discharging element 20, and a second end of the switching module 30 being coupled to a second end of the energy storage module 10; a control module 40, the control module 40 being coupled to a control end of the switching module 30, for controlling the switching module 30 to be turned on, and discharging the energy storage module 10 through the discharging element 20; in the discharging process, the control module 40 acquires an energy accumulation value of the discharging element 20 and / or a discharging time, adjusts the control of the switching module 30 according to the energy accumulation value and / or the discharging time, and reduces the energy accumulation value of the discharging element 20.

[0095] In the above manner, in some extreme cases in the discharging process of the circuit, the discharging element 20 is prone to be damaged. Through the limitation of the energy accumulation value on the discharging element 20 and the discharging time in the discharging process, and the control of the on-off of the circuit and whether to discharge by the switching module 30, it is prevented that the discharged energy exceeds the bearing capacity of the discharging element 20 in the discharging process, causing the damage of components and the like, and the discharging process in multiple different scenes is met. At the same time, if some components are damaged, such as the damage of a diode or the external voltage backflow caused by the failure of the relay drive interference, the circuit can also be protected by using the application solution, and further damage of the circuit is avoided.

[0096] The embodiments of the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the application and its core idea; meanwhile, for those skilled in the art, according to the idea of the application, the specific implementation manner and application range can be changed; in conclusion, the content of the specification should not be understood as the limitation of the application.

Claims

1. A discharge control circuit, characterized by comprising: The discharge control circuit comprises: a storage module; a discharge element, a first end of the discharge element being coupled to a first end of the storage module; a switch module, a first end of the switch module being coupled to a second end of the discharge element, and a second end of the switch module being coupled to a second end of the storage module; a control module, the control module being coupled to a control end of the switch module, and being configured to control the switch module to be turned on, and to discharge the storage module through the discharge element; in the process of discharging, the control module acquires an energy accumulation value of the discharge element and / or a discharge time, and in response to the energy accumulation value being greater than an energy threshold value, the control module controls the switch module to be turned off, and the discharging is stopped; and / or, in response to the discharge time being greater than a time threshold value, the control module controls the switch module to be turned off, the discharging is stopped, and the energy accumulation value of the discharge element is reduced; the control module acquires the energy accumulation value according to a target voltage of the storage module, a resistance value of the discharge element, and an energy dissipation value of the discharge element.

2. The discharge control circuit according to claim 1, characterized by, the control module acquires the time threshold value according to a first voltage of the storage module, a second voltage of the storage module, a capacitance value of the storage module, and the resistance value of the discharge element, wherein the storage module needs to be discharged from the first voltage to the second voltage.

3. The discharge control circuit according to claim 1, characterized by, the time threshold value is obtained by using the following formula: τ=R*C*ln(V1 / V2); T≥n*2τ; wherein R is the resistance value of the discharge element, C is the capacitance value of the storage module, V1 is the voltage value of the first voltage, V2 is the voltage value of the second voltage, τ is the time of discharging the voltage value from V1 to V2, T is the time threshold value, and n is a coefficient.

4. The discharge control circuit of claim 1, wherein the control module acquires the energy threshold value according to a resistance rated power of the discharge element and a rated power multiple.

5. The discharge control circuit according to claim 4, characterized by the energy threshold value is obtained by using the following formula: Qw=a*Wr*A*Tt; wherein Qw is the energy threshold value, a is a coefficient, Wr is the resistance rated power of the discharge element, Tt is a time parameter, and A is the rated power multiple that the discharge element can withstand within Tt.

6. The discharge control circuit of claim 1, wherein the energy dissipation value is obtained by using the following formula: Qr=a*Wr*t; the energy accumulation value is obtained by using the following formula: Qg = 1 - Qg ; wherein Qr is the energy dissipation value dissipated by the discharge element per t time unit, Wr is the rated power of the discharge element, a is a coefficient, t is a time parameter, Qg is the energy accumulation value on the discharge element from 0 time to b time, U is the voltage value applied between the discharge element, and R is the resistance value of the discharge element.

7. A discharge control method characterized by, The application is applied to a discharge control circuit, and the discharge control circuit comprises: a discharge element, a first end of the discharge element being coupled to a first end of a storage module; a switch module, a first end of the switch module being coupled to a second end of the discharge element, and a second end of the switch module being coupled to a second end of the storage module; and a control module, the control module being coupled to a control end of the switch module, and being configured to control the switch module to be turned on, and to discharge the storage module through the discharge element; and the method comprises: During the discharging process, the control module acquires an energy accumulation value and / or a discharging time of the discharging element; The control module controls the switch module to be disconnected and stops discharging in response to the energy accumulation value being greater than an energy threshold value; and / or, the control module controls the switch module to be disconnected and stops discharging in response to the discharging time being greater than a time threshold value, and reduces the energy accumulation value of the discharging element; The control module acquires the energy accumulation value according to a target voltage of the energy storage module, a resistance value of the discharging element and an energy dissipation value of the discharging element.

8. A power supply device characterized by comprising: The power supply device comprises the discharging control circuit according to any one of claims 1-6.

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