Bleeding circuit and charging and discharging equipment

Abstract

The utility model relates to the technical field of power electronics, and discloses a bleeder circuit and a charging and discharging device, the bleeder circuit comprises a bleeder switch circuit and a bleeder branch circuit, the first end of the bleeder switch circuit is connected with the control end and the first end of a charging and discharging switch, the first end of the bleeder switch circuit is connected with the discharging end of an energy storage device, and the second end of the bleeder branch circuit is connected with the discharging end of the energy storage device. The second end is connected with the discharge end of the energy storage equipment, and the control end is connected with the first end of the discharge branch; the second end of the discharge branch is connected with the enabling end of the energy storage equipment; the voltage between the control end and the first end of the charging and discharging switch is larger than the turn-on voltage of the switch in the discharging switch circuit. According to the utility model, under the condition of heavy current loading or short circuit, the switch in the discharge switch circuit can be rapidly and reliably turned on, the discharge path of the charge and discharge switch is increased, and the discharge efficiency and the reliability of the discharge circuit are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power electronics, in particular to a discharge circuit and a charging and discharging device. Background Art

[0002] When the charging and discharging circuit of the energy storage device is under high current load or short circuit, the residual energy needs to be discharged safely and quickly. Usually, transistors are used for fast discharge after the main MOS is turned off. This can be completed quickly when it is normally turned off during testing. However, under high current load, it is limited by the transistor turn-on voltage. When the main MOS reaches the plateau period, the transistor cannot be turned on for discharge, affecting the discharge efficiency of the entire circuit. In addition, due to the large current when loaded, if the energy in the discharge circuit is not discharged in time and the MOS is not turned off to cut off the current, the large current will damage the main MOS, posing a certain safety risk. Utility Model Content

[0003] Therefore, the technical problem to be solved by the present invention is to solve the problem in the prior art that when the main charge and discharge switch of the energy storage device is turned off, the rear-end discharge circuit is easily subject to failure due to the limitation of the start-up voltage, thereby providing a discharge circuit and a charging and discharging device.

[0004] In order to achieve the above object, the utility model provides the following technical solutions:

[0005] In a first aspect, the utility model provides a discharge circuit, which is applied to a charge and discharge circuit of an energy storage device, and the discharge circuit includes: a discharge switch circuit and a discharge branch, wherein the discharge switch circuit has a first end connected to a control end of the charge and discharge switch, a second end connected to a discharge end of the energy storage device and a first end of the charge and discharge switch, and a control end connected to a first end of the discharge branch; the discharge branch has a second end connected to a third end of an anti-reverse circuit and an enable end of the energy storage device; a voltage between the control end and the first end of the charge and discharge switch is greater than a turn-on voltage of a switch in the discharge switch circuit; when the charge and discharge switch is turned off based on an enable signal of the enable end of the energy storage device, the discharge switch circuit is turned on, and the energy in the charge and discharge switch is discharged to the discharge end and the enable end of the energy storage device through the discharge switch circuit and the discharge branch, respectively.

[0006] In the discharge circuit provided by the utility model, when the charge-discharge switch reaches the Miller plateau period, the voltage between the control end and the first end of the charge-discharge switch is maintained at a fixed voltage value, and by selecting a switch in the discharge switch circuit whose turn-on voltage is less than the fixed voltage value, it is ensured that even if the charge-discharge switch is turned off and reaches the plateau period, the voltage across the control end and the first end of the charge-discharge switch can still reach the turn-on voltage of the discharge switch circuit when the voltage is low, so that the switch in the discharge switch circuit can still be reliably turned on, reducing the discharge threshold of the charge-discharge switch, and avoiding the discharge switch circuit being limited by an excessively high turn-on voltage, resulting in the energy in the circuit being unable to be discharged in time.

[0007] The utility model also increases a discharge branch so that the energy in the charge-discharge switch can not only be discharged to the discharge end of the energy storage device through the discharge switch circuit, but also be discharged to the enable end of the energy storage device through the discharge branch, thereby improving the discharge speed and discharge efficiency, enabling the charge-discharge switch to be quickly turned off, reducing the damage of the large current in the circuit to the charge-discharge switch and the energy storage device, and improving the safety and service life of the energy storage device.

[0008] In an optional embodiment, the discharge circuit also includes: an anti-reverse circuit, a first end of which is connected to the first end of the discharge switch circuit, a second end of which is connected to the first end of the charge and discharge switch, and a third end of which is connected to the second end of the discharge branch, and is used to prevent the current in the charge and discharge switch from flowing reversely into the enable end of the energy storage device when the discharge switch circuit is turned off.

[0009] The discharge circuit and the anti-reverse circuit provided by the utility model can prevent the energy in the discharge circuit from flowing back into the energy storage device, thereby increasing the service life of the energy storage device.

[0010] In an optional embodiment, the discharge switch circuit includes: a first switch and a first resistor, wherein the first switch has a first end connected to the first end of the anti-reverse circuit, a second end connected to the first end of the first resistor, and a control end connected to the second end of the anti-reverse circuit; the first resistor has a second end connected to the discharge end of the energy storage device; the voltage between the control end and the first end of the charge and discharge switch is greater than the turn-on voltage of the first switch; when the charge and discharge switch is turned off based on the enable signal of the enable end of the energy storage device, the first switch is turned on.

[0011] In the discharge circuit provided by the utility model, during the Miller plateau period in the process of turning off the charge and discharge switch, the voltage between the control end and the first end of the charge and discharge switch is maintained at a fixed voltage value, and by selecting a first switch whose turn-on voltage is less than the fixed voltage value, even when the charge and discharge switch is turned off and reaches the Miller plateau period, resulting in the voltage between the control end and the first end of the charge and discharge switch being maintained at a small value, the turn-on voltage of the first switch can still be reached, thereby ensuring that the first switch maintains a conducting state, and providing a discharge path for the energy in the circuit.

[0012] In an optional embodiment, the anti-reverse circuit includes: a first diode and a second diode, wherein the cathode and anode of the first diode are respectively connected to the first end and the second end of the discharge branch, and the cathode is also connected to the anode of the second diode; the cathode of the second diode is connected to the first end of the first switch.

[0013] In an optional implementation, the discharge branch includes: a second resistor connected in parallel with the first diode.

[0014] In an optional embodiment, the discharge circuit further includes: a clamping circuit, a first end of which is connected to the first end of the charge and discharge switch, and a second end of which is connected to the control end of the charge and discharge switch, and is used to limit the voltage between the first end and the control end of the charge and discharge switch.

[0015] The discharge circuit and clamping circuit provided by the utility model can protect the charge and discharge switch from being broken down by the reverse voltage.

[0016] In an optional embodiment, the discharge circuit also includes: a voltage stabilizing circuit, a first end of which is connected to the first end of the discharge switch circuit, and a second end of which is connected to the second end of the discharge switch circuit, which is used to limit the voltage fluctuation in the circuit and provide a discharge path for the energy in the charge and discharge switch to the discharge end.

[0017] The discharge circuit and the voltage stabilizing circuit provided by the utility model are used to eliminate the harmonic interference at the discharge end of the energy storage device, so that the energy storage device can discharge stably.

[0018] In an optional embodiment, the voltage stabilizing circuit includes: a fourth diode, a first capacitor and a third resistor, wherein the fourth diode has a cathode connected to the first end of the discharge switch circuit, the first end of the first capacitor and the first end of the third resistor, and an anode connected to the second end of the first capacitor, the second end of the third resistor and the discharge end of the energy storage device.

[0019] In an optional embodiment, the discharge circuit further includes: a first current limiting circuit, a first end of which is connected to the first end of the charge and discharge switch, and a second end of which is connected to the first end of the discharge switch circuit, and is used to limit the magnitude of the current flowing into the discharge switch circuit.

[0020] In an optional implementation, the discharge circuit further includes: a second current limiting circuit, a first end of which is connected to the third end of the anti-reverse circuit, and a second end of which is connected to the enable end of the energy storage device, and is used to limit the current size of the enable signal.

[0021] In a second aspect, the utility model provides a charging and discharging device, comprising: a charging and discharging switch and the discharge circuit of the first aspect, wherein the charging and discharging switch has a first end connected to its control end and the first end of the discharge switch circuit, and a second end connected to the charging end of the charging and discharging device; the enable end of the charging and discharging device is connected to the second end of the discharge branch; when the charging and discharging switch is turned off based on an enable signal of the enable end of the charging and discharging device, the discharge switch circuit is turned on, and the energy in the charging and discharging switch is discharged to the discharge end and the enable end of the charging and discharging device respectively through the discharge switch circuit and the discharge branch.

[0022] In the charging and discharging device provided by the utility model, when the charging and discharging switch is in the Miller plateau period, the voltage between the control end and the first end thereof is greater than the turn-on voltage of the switch in the discharge switch circuit, ensuring that even if the charging and discharging switch is turned off and reaches the plateau period, the voltages across the control end and the first end of the charging and discharging switch are low and the turn-on voltage of the discharge switch circuit can still be reached, so that the switch in the discharge switch circuit can still be reliably turned on, lowering the discharge threshold of the charging and discharging switch, and avoiding the discharge switch circuit being limited by an excessively high turn-on voltage, resulting in the energy in the circuit being unable to be discharged in time.

[0023] The utility model also increases a discharge branch so that the energy in the charge-discharge switch can not only be discharged to the discharge end of the energy storage device through the discharge switch circuit, but also be discharged to the enable end of the energy storage device through the discharge branch, thereby improving the discharge speed and discharge efficiency, enabling the charge-discharge switch to be quickly turned off, reducing the damage of the large current in the circuit to the charge-discharge switch and the energy storage device, and improving the safety and service life of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A composition diagram of a specific example of a discharge circuit according to an embodiment of the present utility model;

[0026] Figure 2 A composition diagram of another specific example of a discharge circuit according to an embodiment of the present utility model;

[0027] Figure 3 A structural diagram of a specific circuit of a discharge circuit according to an embodiment of the utility model;

[0028] Figure 4 It is a structural diagram of another specific circuit of the discharge circuit of the embodiment of the utility model;

[0029] Figure 5 The figure is a composition diagram of a specific example of the charging and discharging device of the embodiment of the utility model. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0034] In the related art, when the energy storage device is under high current load or short circuit, the residual energy in the charge and discharge circuit needs to be quickly discharged through the discharge circuit. When the charge and discharge switch reaches the plateau period, the voltage at both ends cannot reach the opening voltage of the switch in the discharge circuit, resulting in the discharge circuit being unable to open and discharge in time. The continuous high current in the circuit damages the energy storage device and the charge and discharge switch. In order to overcome the above defects,

[0035] This embodiment provides a discharge circuit 1, which is applied to a charge and discharge circuit of an energy storage device, such as Figure 1 As shown, the discharge circuit 1 includes: a discharge switch circuit 11 and a discharge branch 12 .

[0036] like Figure 1As shown, the discharge switch circuit 11 has a first end connected to the control end of the charge and discharge switch Q2, a second end connected to the discharge end P+ of the energy storage device and the first end of the charge and discharge switch Q2, and a control end connected to the first end of the discharge branch 12.

[0037] Specifically, Figure 1 In the embodiment, the turn-on voltage of the switch in the discharge switch circuit 11 is less than the voltage between the control terminal and the first terminal of the charge-discharge switch Q2, so that even if the voltage between the two terminals of the charge-discharge switch Q2 is low due to being in a plateau period, the turn-on voltage of the switch in the discharge switch circuit 11 can still be reached, thereby lowering the discharge threshold of the charge-discharge switch Q2, ensuring that the discharge switch circuit 11 is reliably turned on during the entire discharge process, and improving the safety of the energy storage device.

[0038] like Figure 1 As shown, the second end of the discharge branch 12 is connected to the enable end EN of the energy storage device.

[0039] Specifically, Figure 1 In the embodiment, the discharge branch 12 is used to provide a path for the energy in the charge-discharge switch Q2 to be discharged to the enable terminal EN of the energy storage device, thereby quickly discharging the residual energy in the charge-discharge switch Q2 and improving the discharge efficiency.

[0040] like Figure 1 As shown, the charging terminal B+ of the energy storage device is connected to the second end of the charge and discharge switch Q2.

[0041] Specifically, Figure 1 In the embodiment, when the charge and discharge switch Q2 is turned on, the discharge switch circuit 11 is turned off, and the energy storage device can charge the internal battery cell through the charging terminal B+, or discharge the energy storage device through the discharge terminal P+. At this time, no current flows through the discharge switch circuit 11 and the discharge branch 12.

[0042] Specifically, Figure 1 When the charge-discharge switch Q2 is turned off, the discharge switch circuit 11 is turned on, and the residual energy in the charge-discharge switch Q2 is discharged to the discharge terminal P+ of the energy storage device and the enable terminal EN of the energy storage device through the discharge switch circuit 11 and the discharge branch 12 respectively.

[0043] It should be noted that the switch in the discharge switch circuit 11 can be a triode or a MOS tube. When it is a MOS tube, the discharge branch 12 is no longer used to provide a discharge path, but is used to adjust the oscillation frequency of the circuit after the charge and discharge switch Q2 is turned off with load by adjusting its internal resistance.

[0044] In the discharge circuit provided in the present embodiment, when the charge-discharge switch is in the Miller plateau period, the voltage between the control terminal and the first terminal thereof is greater than the turn-on voltage of the switch in the discharge switch circuit, ensuring that even when the charge-discharge switch is turned off and reaches the plateau period, the voltages across the control terminal and the first terminal of the charge-discharge switch are low and the turn-on voltage of the discharge switch circuit can still be reached, so that the switch in the discharge switch circuit can still be turned on reliably, reducing the discharge threshold of the charge-discharge switch, and preventing the discharge switch circuit from being limited by an excessively high turn-on voltage, resulting in the energy in the circuit being unable to be discharged in time.

[0045] This embodiment also increases a discharge branch so that the energy in the charge-discharge switch can not only be discharged to the discharge end of the energy storage device through the discharge switch circuit, but also be discharged to the enable end of the energy storage device through the discharge branch, thereby improving the discharge speed and discharge efficiency, enabling the charge-discharge switch to be quickly turned off, reducing the damage of the large current in the circuit to the charge-discharge switch and the energy storage device, and improving the safety and service life of the energy storage device.

[0046] In some optional embodiments, such as Figure 2 As shown, the discharge circuit 1 also includes: an anti-reverse circuit 13, a first end of which is connected to the first end of the discharge switch circuit 11, a second end of which is connected to the first end of the charge and discharge switch Q2, and a third end of which is connected to the second end of the discharge branch 12.

[0047] Specifically, Figure 2 In the embodiment, the anti-reverse circuit 13 is used to prevent the current in the charge-discharge switch Q2 from reversely flowing into the enable terminal EN of the energy storage device when the discharge switch circuit 11 is turned off.

[0048] In some optional embodiments, such as Figure 3 As shown, the discharge switch circuit 11 includes: a first switch Q1 and a first resistor R1, wherein the first switch Q1, a first end thereof is connected to the first end of the anti-reverse circuit 13, a second end thereof is connected to the first end of the first resistor R1, and a control end thereof is connected to the second end of the anti-reverse circuit 13; the first resistor R1, a second end thereof is connected to the discharge end P+ of the energy storage device; the voltage between the control end and the first end of the charge-discharge switch Q2 is greater than the turn-on voltage of the first switch; when the charge-discharge switch Q2 is turned off based on the enable signal of the enable end EN of the energy storage device, the first switch Q1 is turned on.

[0049] Optionally, the charge and discharge switch Q2 is a MOS tube, and the first switch Q1 can be a triode or a MOS tube, wherein:

[0050] (1) Figure 3As shown, when the first switch Q1 is a triode, after the charge-discharge switch Q2 is turned off based on the enable signal, since the selected turn-on voltage of the first switch Q1 is much smaller than the gate-source voltage of the charge-discharge switch Q2, even if the first switch Q1 is turned off and reaches the Miller plateau period, the first switch Q1 can still be reliably turned on, so that the residual energy inside the charge-discharge switch Q2 is discharged to the discharge terminal P+ of the energy storage device through the discharge switch circuit 11 in one way, and discharged to the enable terminal EN of the energy storage device through Q1 and the discharge branch 12 in the discharge switch circuit 11 in another way.

[0051] (2) Figure 4 As shown, when the first switch Q1 is a MOS tube, after the charge and discharge switch Q2 is turned off based on the enable signal, since the MOS tube turn-on voltage is small, even if the first switch Q1 is turned off and reaches the Miller plateau period, the first switch Q1 can still be reliably turned on, so that the residual energy inside the charge and discharge switch Q2 is discharged to the discharge terminal P+ of the energy storage device through the discharge switch circuit 11.

[0052] In some optional embodiments, such as Figure 3 As shown, the anti-reverse circuit 13 includes: a first diode D1 and a second diode D2, wherein the cathode and anode of the first diode D1 are respectively connected to the first end and the second end of the discharge branch 12, and the cathode is also connected to the anode of the second diode D2; the cathode of the second diode D2 is connected to the first end of the first switch Q1.

[0053] Specifically, Figure 3 In the embodiment, after the enable signal of the energy storage device is sent out from the enable terminal EN, it flows into the gate of the charge-discharge switch Q2 in one direction through the first diode D1 and the second diode D2 in sequence.

[0054] It should be noted that the number of diodes in the anti-reverse circuit is not limited.

[0055] In some optional embodiments, such as Figure 3 As shown, the discharge branch 12 includes: a second resistor R2 connected in parallel with the first diode D1.

[0056] Specifically, when the first switch Q1 is a triode or a MOS tube, the second resistor R2 has the following two functions:

[0057] (1) Figure 3 As shown, when the first switch Q1 is a triode, after the charge and discharge switch Q2 is turned off, the first switch Q1 is turned on, so that the residual energy inside the charge and discharge switch Q2 is discharged to the discharge terminal P+ of the energy storage device through the discharge switch circuit 11, and is discharged to the enable terminal EN of the energy storage device through Q1 and the second resistor R2 in the discharge switch circuit 11.

[0058] (2) Figure 4As shown, when the first switch Q1 is a MOS tube, after the charge and discharge switch Q2 is turned off, the first switch Q1 is turned on, so that the residual energy inside the charge and discharge switch Q2 is discharged to the discharge terminal P+ of the energy storage device through the discharge switch circuit 11. At this time, the second resistor R2 is no longer used to provide a discharge path, but is used to adjust the resonant frequency of the equivalent capacitor in the circuit by adjusting the resistance value of the second resistor R2, thereby adjusting the oscillation frequency of the circuit after the charge and discharge switch Q2 is turned off with load.

[0059] In some optional embodiments, such as Figure 3 As shown, the discharge circuit 1 also includes: a clamp circuit 14, a first end of which is connected to the first end of the charge and discharge switch Q2, and a second end of which is connected to the control end of the charge and discharge switch Q2, which is used to limit the voltage between the first end and the control end of the charge and discharge switch Q2.

[0060] Alternatively, if Figure 3 As shown, the clamping circuit 14 may include a diode D3. When the gate-source voltage of the charge-discharge switch Q2 exceeds the forward conduction voltage of the diode D3, the diode D3 will be turned on, thereby limiting the gate-source voltage of the charge-discharge switch Q2 from exceeding a threshold value; when the gate-source voltage of the charge-discharge switch Q2 is lower than the reverse breakdown voltage of the diode D3, the diode D3 will be turned off to prevent the gate-source voltage of the charge-discharge switch Q2 from further decreasing.

[0061] In some optional embodiments, such as Figure 3 As shown, the discharge circuit 1 also includes: a voltage stabilizing circuit 15, a first end of which is connected to the first end of the discharge switch circuit 11, and a second end of which is connected to the second end of the discharge switch circuit 11, which is used to limit the voltage fluctuation in the circuit and provide a discharge path for the energy in the charge and discharge switch Q2 to the discharge terminal P+.

[0062] Alternatively, if Figure 3 As shown, the voltage stabilizing circuit 15 includes: a fourth diode D4, a first capacitor C1 and a third resistor R3, wherein the fourth diode D4 has a cathode connected to the first end of the discharge switch circuit 11, the first end of the first capacitor C1 and the first end of the third resistor R3, and an anode connected to the second end of the first capacitor C1, the second end of the third resistor R3 and the discharge end P+ of the energy storage device.

[0063] It should be noted that the residual energy after the charge-discharge switch Q2 is turned off can also be discharged to the discharge terminal P+ of the energy storage device through the third resistor R3.

[0064] In some optional embodiments, such as Figure 3As shown, the discharge circuit 1 further includes: a first current limiting circuit 16 and a second current limiting circuit 17. The first current limiting circuit 16 has a first end connected to the first end of the charge and discharge switch Q2, and a second end connected to the first end of the discharge switch circuit, and is used to limit the magnitude of the current flowing into the discharge switch circuit. The second current limiting circuit 17 has a first end connected to the third end of the anti-reverse circuit 13, and a second end connected to the enable end EN of the energy storage device, and is used to limit the current magnitude of the enable signal.

[0065] Specifically, Figure 3 In the embodiment, the magnitude of the current passing through can be adjusted by the resistance values ​​of the resistors in the first current limiting circuit 16 and the second current limiting circuit 17, thereby controlling the discharge efficiency of the residual energy.

[0066] Specifically, when the first switch Q1 is a triode or a MOS tube, the discharge paths are as follows:

[0067] (1) Figure 3 In the embodiment, when the first switch Q1 is a triode, after the charge-discharge switch Q2 is turned off, the residual energy inside the charge-discharge switch Q2 passes through R4. → Q1 → R1 → P+ discharge, the other way through R4 → Q1 → R2 → R5 → EN bleed.

[0068] (2) Figure 4 In the embodiment, when the first switch Q1 is a MOS tube, after the charge-discharge switch Q2 is turned off, the residual energy inside the charge-discharge switch Q2 is transferred through R4. → Q1 → R1 → P+ discharge.

[0069] This embodiment provides an energy storage device, such as Figure 5 As shown, it includes: a charge and discharge switch Q2 and a discharge circuit 1 of the above embodiments and any optional implementation manner thereof, wherein the charge and discharge switch Q2 has a first end connected to its control end and a first end of the discharge switch circuit 11, and a second end connected to a charging end B+ of the charge and discharge device; and an enable end EN of the energy storage device is connected to a second end of the discharge branch 12.

[0070] Figure 5 In the embodiment, when the charge and discharge switch Q2 is turned off based on the enable signal of the enable terminal EN of the energy storage device, the discharge switch circuit 11 is turned on, and the energy in the charge and discharge switch Q2 is discharged to the discharge terminal P+ and the enable terminal EN of the charge and discharge device through the discharge switch circuit 11 and the discharge branch 12 respectively.

[0071] It should be noted that the discharge path and discharge principle of the residual energy after the charge-discharge switch Q2 is turned off in this embodiment are consistent with the contents described in the above embodiment and any optional implementation manner thereof, and will not be repeated here.

[0072] In the charge-discharge device provided in this embodiment, the voltage between the control end and the first end of the charge-discharge switch is greater than the opening voltage of the switch in the discharge switch circuit, ensuring that even when the charge-discharge switch is turned off and reaches a plateau period, the voltage between the control end and the first end of the charge-discharge switch is low, and the opening voltage of the discharge switch circuit can still be reached, so that the switch in the discharge switch circuit can still be reliably turned on, reducing the discharge threshold of the charge-discharge switch, and avoiding the discharge switch circuit being limited by an excessively high opening voltage, resulting in the energy in the circuit not being able to be discharged in time. The utility model also increases the discharge branch so that the energy in the charge-discharge switch can not only be discharged to the discharge end of the energy storage device through the discharge switch circuit, but also can be discharged to the enable end of the energy storage device through the discharge branch, thereby improving the discharge speed and discharge efficiency, enabling the charge-discharge switch to be quickly turned off, reducing the damage of the large current in the circuit to the charge-discharge switch and the energy storage device, and improving the safety and service life of the energy storage device.

[0073] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A discharge circuit, characterized in that: Applied to the charging and discharging circuit of energy storage equipment, the discharge circuit includes: a discharge switch circuit and a discharge branch circuit, wherein: A discharge switch circuit, wherein a first end of the discharge switch circuit is connected to a control end of the charge-discharge switch, a second end of the discharge switch circuit is connected to a discharge end of the energy storage device and a first end of the charge-discharge switch, and a control end of the discharge switch circuit is connected to a first end of the discharge branch circuit; A discharge branch, a second end of which is connected to an enabling end of the energy storage device; The charging end of the energy storage device is connected to the second end of the charge and discharge switch; The voltage between the control terminal and the first terminal of the charge-discharge switch is greater than the turn-on voltage of the switch in the discharge switch circuit; When the charge and discharge switch is turned off based on the enable signal of the enable end of the energy storage device, the discharge switch circuit is turned on, and the energy in the charge and discharge switch is discharged to the discharge end of the energy storage device and the enable end of the energy storage device through the discharge switch circuit and the discharge branch.

2. The discharge circuit according to claim 1, characterized in that: Also includes: An anti-reverse circuit, a first end of which is connected to the first end of the discharge switch circuit, a second end of which is connected to the first end of the charge-discharge switch, and a third end of which is connected to the second end of the discharge branch, and is used to prevent the current in the charge-discharge switch from flowing reversely into the enable end of the energy storage device when the discharge switch circuit is turned off.

3. The discharge circuit according to claim 2, characterized in that: The discharge switch circuit includes: a first switch and a first resistor, wherein: A first switch, a first end of which is connected to the first end of the anti-reverse circuit, a second end of which is connected to the first end of the first resistor, and a control end of which is connected to the second end of the anti-reverse circuit; a first resistor, a second end of which is connected to a discharge end of the energy storage device; The voltage between the control terminal and the first terminal of the charge-discharge switch is greater than the turn-on voltage of the first switch; When the charge and discharge switch is turned off based on the enable signal of the enable terminal of the energy storage device, the first switch is turned on.

4. The discharge circuit according to claim 3, characterized in that: The anti-reverse circuit includes: a first diode and a second diode, wherein: a first diode, whose cathode and anode are respectively connected to the first end and the second end of the discharge branch, and whose cathode is also connected to the anode of the second diode; A cathode of a second diode is connected to the first end of the first switch.

5. The discharge circuit according to claim 4, characterized in that: The discharge branch comprises: A second resistor is connected in parallel with the first diode.

6. The discharge circuit according to claim 1, characterized in that: Also includes: A clamp circuit, whose first end is connected to the first end of the charge and discharge switch and whose second end is connected to the control end of the charge and discharge switch, is used to limit the voltage between the first end and the control end of the charge and discharge switch.

7. The discharge circuit according to claim 1, characterized in that: Also includes: A voltage stabilizing circuit, a first end of which is connected to the first end of the discharge switch circuit, and a second end of which is connected to the second end of the discharge switch circuit, is used to limit voltage fluctuations in the circuit and provide a discharge path for the energy in the charge and discharge switch to the discharge end.

8. The discharge circuit according to claim 7, characterized in that: The voltage stabilizing circuit includes: a fourth diode, a first capacitor and a third resistor, wherein: A fourth diode, a cathode of which is connected to the first end of the discharge switch circuit, the first end of the first capacitor and the first end of the third resistor, and an anode of which is connected to the second end of the first capacitor, the second end of the third resistor and the discharge end of the energy storage device.

9. The discharge circuit according to claim 1, characterized in that: Also includes: The first current limiting circuit has a first end connected to the first end of the charge and discharge switch and a second end connected to the first end of the discharge switch circuit, and is used to limit the magnitude of the current flowing into the discharge switch circuit.

10. The discharge circuit according to claim 2, characterized in that: Also includes: The second current limiting circuit has a first end connected to the third end of the anti-reverse circuit and a second end connected to the enable end of the energy storage device, and is used to limit the current size of the enable signal.

11. A charging and discharging device, characterized in that: include: A charge and discharge switch and a discharge circuit as claimed in any one of claims 1 to 10, wherein: A charge-discharge switch, a first end of which is connected to its control end and the first end of the discharge switch circuit, and a second end of which is connected to the charging end of the charge-discharge device; The enabling end of the charging and discharging device is connected to the second end of the discharge branch; When the charge and discharge switch is turned off based on the enable signal of the enable end of the charge and discharge device, the discharge switch circuit is turned on, and the energy in the charge and discharge switch is discharged to the discharge end and the enable end of the charge and discharge device through the discharge switch circuit and the discharge branch.

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