CN113131595A - Discharge circuit - Google Patents
Discharge circuit Download PDFInfo
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- CN113131595A CN113131595A CN201911404491.5A CN201911404491A CN113131595A CN 113131595 A CN113131595 A CN 113131595A CN 201911404491 A CN201911404491 A CN 201911404491A CN 113131595 A CN113131595 A CN 113131595A
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- discharge
- filter capacitor
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- discharged
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
- H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
Abstract
The invention relates to the technical field of electronic circuits, and provides a discharge circuit. The discharge circuit includes: the device comprises a first filter capacitor, a second filter capacitor and a discharge switch circuit, wherein the first filter capacitor and the second filter capacitor are connected in series and then are connected in parallel with a capacitor to be discharged; the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the second filter capacitor and discharge to the first filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the first filter capacitor and discharge to the second filter capacitor at the same time. The discharge circuit of the invention can use smaller volume and discharge safely and reliably.
Description
Technical Field
The present invention relates to electronic circuits, and particularly to a discharge circuit.
Background
The existing active discharge Circuit mainly comprises Printed Circuit Board (PCB) chip resistor array discharge, external cement resistor discharge, motor winding discharge, inverter IGBT or MOSFET power-saving capacitance charge and discharge and other modes, but the PCB chip resistor array discharge is easy to ignite to cause large-area burning of the Circuit Board; the external cement resistor needs extra space and special structural design for discharging, so that the cost is high; the motor winding discharge and the inverter IGBT or MOSFET energy-saving capacitor charge and discharge are easy to conflict with the state of the motor when entering the safety mode, and the safety of the system is affected.
Disclosure of Invention
In view of the above, the present invention is directed to a discharge circuit for safely and reliably discharging a discharge signal with a small size.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a discharge circuit, the discharge circuit comprising: the device comprises a first filter capacitor, a second filter capacitor and a discharge switch circuit, wherein the first filter capacitor and the second filter capacitor are connected in series and then are connected in parallel with a capacitor to be discharged; the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the second filter capacitor and discharge to the first filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the first filter capacitor and discharge to the second filter capacitor at the same time.
Further, the discharge switching circuit includes: the first discharge switch is connected with the first filter capacitor in parallel, and the second discharge switch is connected with the second filter capacitor in parallel, wherein when the first discharge switch is turned on and the second discharge switch is turned off, the capacitor to be discharged is discharged to the second filter capacitor, and meanwhile, the first filter capacitor is discharged through the first discharge switch; when the second discharging switch is turned on and the first discharging switch is turned off, the capacitor to be discharged discharges to the first filter capacitor, and meanwhile, the second filter capacitor discharges through the second discharging switch.
Further, when the first discharge switch and the second discharge switch are turned off at the same time, the capacitor to be discharged discharges to the first filter capacitor and the second filter capacitor at the same time.
Further, the discharge circuit further includes: the capacitor to be discharged is connected in parallel with the third filter capacitor and the fourth filter capacitor after being connected in series; the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the fourth filter capacitor and discharge to the third filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the third filter capacitor and discharge to the fourth filter capacitor at the same time.
Further, the discharge switch circuit further includes a third discharge switch connected in parallel to the third filter capacitor, and a fourth discharge switch connected in parallel to the fourth filter capacitor, where when the third discharge switch is turned on and the fourth discharge switch is turned off, the capacitor to be discharged is discharged to the fourth filter capacitor, and the third filter capacitor is discharged through the third discharge switch; when the fourth discharging switch is turned on and the third discharging switch is turned off, the capacitor to be discharged discharges to the third filter capacitor, and meanwhile, the fourth filter capacitor discharges through the fourth discharging switch.
Further, when the third discharge switch and the fourth discharge switch are turned off at the same time, the capacitor to be discharged discharges to the third filter capacitor and the fourth filter capacitor at the same time.
Further, the discharge circuit further includes: one end of the first current transformer is connected with the first discharging switch and the second discharging switch, and the other end of the first current transformer is connected with the first filter capacitor and the second filter capacitor and used for collecting discharging current signals.
Further, the discharge circuit further includes: one end of the first current transformer is connected with the first discharging switch, the other end of the first current transformer is connected with the second discharging switch, the other end of the first current transformer is connected with the first filter capacitor, one end of the second current transformer is connected with the second filter capacitor, one end of the third current transformer is connected with the third discharging switch, the other end of the fourth current transformer is connected with the third filter capacitor, and the third current transformer is used for collecting discharging current signals.
Further, the discharge circuit further includes: and one end of the fourth current transformer is connected with the first discharge switch and the second discharge switch, and the other end of the fourth current transformer is connected with the third filter capacitor and the fourth filter capacitor and is used for collecting discharge current signals.
Further, the first filter capacitor, the second filter capacitor, the third filter capacitor and the fourth filter capacitor are high-voltage filter capacitors.
Compared with the prior art, the discharge circuit has the following advantages:
the discharge circuit of the present invention includes: the device comprises a first filter capacitor, a second filter capacitor and a discharge switch circuit, wherein the first filter capacitor and the second filter capacitor are connected in series and then are connected in parallel with a capacitor to be discharged; the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the second filter capacitor and discharge to the first filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the first filter capacitor and discharge to the second filter capacitor at the same time. The discharge circuit of the invention uses less devices, does not need a large amount of space, and can discharge safely and reliably.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a block diagram of a discharge circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a discharge circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a discharge circuit according to another embodiment of the present invention;
FIG. 4 is a schematic diagram of a discharge circuit according to another embodiment of the present invention;
FIG. 5A is a schematic diagram of a discharge circuit according to another embodiment of the present invention;
fig. 5B is a schematic structural diagram of a discharge circuit according to another embodiment of the present invention.
Detailed Description
In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
Fig. 1 is a block diagram of a discharge circuit according to an embodiment of the present invention. As shown in fig. 1, the discharge circuit includes: the circuit comprises a first filter capacitor C1, a second filter capacitor C2 and a discharge switch circuit, wherein the first filter capacitor C1 and the second filter capacitor C2 are connected in series and then are connected in parallel with a capacitor C3 to be discharged; the discharge switch circuit is used for controlling the capacitor C3 to be discharged to discharge to the second filter capacitor C2 and discharge to the first filter capacitor C1 at the same time, or controlling the capacitor C3 to be discharged to discharge to the first filter capacitor C1 and discharge to the second filter capacitor C2 at the same time.
Specifically, in the figure, V3 is a battery, a contactor is included to control on and off, and C3 is, for example, a bus capacitor of a motor controller. The C1 and C2 can be high-voltage filter capacitors at the end of the PCB, generally lower than 1uF, and the capacitors can be shared with other circuits without additional cost increase.
In the discharge circuit of this embodiment, the discharge switch circuit may discharge the capacitor C3 to be discharged to the first filter capacitor C1 and the second filter capacitor C2, and then discharge the capacitor C3 to be discharged to the second filter capacitor C2 and the first filter capacitor C1, so that the capacitor C3 to be discharged may be continuously discharged alternately. The following will provide a structure of a discharge switch circuit.
Fig. 2 is a schematic structural diagram of a discharge circuit according to an embodiment of the present invention. As shown in fig. 2, the discharge switching circuit includes: a first discharging switch M1 connected in parallel with the first filter capacitor C1, and a second discharging switch M2 connected in parallel with the second filter capacitor C2, wherein when the first discharging switch M1 is turned on and the second discharging switch M2 is turned off, the capacitor C3 to be discharged is discharged to the second filter capacitor C2, and simultaneously the first filter capacitor C1 is discharged through the first discharging switch M1; when the second discharging switch M2 is turned on and the first discharging switch M1 is turned off, the capacitor C3 to be discharged discharges to the first filter capacitor C1, and at the same time, the second filter capacitor C2 discharges through the second discharging switch M2; when the first discharging switch M1 and the second discharging switch M2 are turned off at the same time, the capacitor C3 to be discharged discharges to the first filter capacitor C1 and the second filter capacitor C2 at the same time.
Specifically, the first discharge switch M1 and the second discharge switch M2 are turned on complementarily, so that the element with higher internal resistance can be selected to enhance the discharge effect, but the heat dissipation problem needs to be considered. V1 and V2 are excitation sources, namely the on-off of the first discharge switch M1 and the second discharge switch M2 can be controlled.
The discharging circuit of this embodiment needs to assume that the system is already in balance before the discharging circuit does not work, that is: the voltage of the first filter capacitor C1 is equal to the voltage of the second filter capacitor C2 is equal to half the voltage of the power supply V3, and the excitation sources V1 and V2 are equal to zero. The discharge circuit has the following two states:
in the first state, when the capacitor C3 to be discharged discharges to the second filter capacitor C2 and the first filter capacitor C1 discharges through the first discharge switch M1, the energy stored in the first filter capacitor C1 is consumed, the energy in the capacitor C3 to be discharged is transferred to the second filter capacitor C2, and the internal resistance of the first discharge switch M1 converts the flowing current into heat to be dissipated, thereby consuming part of the energy.
In the second state, when the capacitor C3 to be discharged discharges to the first filter capacitor C1 and the second filter capacitor C2 discharges through the second discharge switch M2, the energy stored in the second filter capacitor C2 is consumed, the energy of the capacitor C3 to be discharged is transferred to the first filter capacitor C1, and the internal resistance of the second discharge switch M2 converts the flowing current into heat to be dissipated, thereby consuming part of the energy.
In the middle of the above two state switching, there is another transitional state, namely:
in the third state, the capacitor C3 to be discharged charges the first filter capacitor C1 and the second filter capacitor C2 through the series structure of the first filter capacitor C1 and the second filter capacitor C2. Ideally, no energy is dissipated in this state, and only energy is transferred from the capacitor C3 to be discharged to the first filter capacitor C1 and the second filter capacitor C2, but during the transfer, the series impedance of the first filter capacitor C1, the second filter capacitor C2 and the capacitor C3 to be discharged will continue to dissipate a part of the energy.
Therefore, the present invention can use the discharge circuit to make the discharge circuit in the first state (the first discharge switch M1 is turned on and the second discharge switch M2 is turned off), then in the third state (the first discharge switch M1 and the second discharge switch M2 are turned off at the same time), then in the second state (the second discharge switch M2 is turned on and the first discharge switch M1 is turned off), and then in the third state, and so on to cycle to perform the discharge. As can be seen from the above description, in each action of the first discharge switch M1 and the second discharge switch M2, current flows from the capacitor C3 to be discharged to the discharge loop, and the first discharge switch M1 and the second discharge switch M2 can dissipate energy by heating to achieve discharge. The discharge speed can be adjusted by the on-time and switching frequency of the first and second discharge switches M1 and M2, with longer on-time and higher frequency resulting in faster discharge speed. The blocking devices of the discharge circuit are in series so that no overall failure occurs in the event of a single failure.
Fig. 3 is a schematic structural diagram of a discharge circuit according to another embodiment of the present invention. As shown in fig. 3, the discharge circuit further includes: and the first current transformer L1 is connected with the first discharging switch M1 and the second discharging switch M2 at one end, and connected with the first filter capacitor C1 and the second filter capacitor C2 at the other end, and is used for collecting discharging current signals.
Specifically, resistors R1-R3 are added in the circuit of the embodiment of the invention, and V4 and V5 are excitation sources. The embodiment realizes isolation sampling by using the current transformer, meets the requirement of functional safety and simultaneously gives consideration to the cost. Meanwhile, temperature sensors (NTC1 and NTC2) can be placed near the first discharge switch M1 and the second discharge switch M2 to protect the circuit, whether the temperature is over-temperature or whether the collected discharge current is abnormal is judged through a temperature and discharge current management unit, and when the temperature is over-temperature and abnormal, a switching value signal can be given to enable a pulse generation unit to send out a pulse, so that a complementary driving unit correspondingly adjusts the on-off of the first discharge switch M1 and the second discharge switch M2.
In more detail, when the first discharging switch M1 is short-circuited, since the second discharging switch M2 and the first filter capacitor C1 are normal, the discharging circuit is not short-circuited, and the fault can be detected by the current transformer (the current transformer will not detect a continuous discharging current signal, and the waveform is abnormal). In the worst case, if the first discharging switch M1 and the second discharging switch M2 are connected in a straight-through manner, the resistor R3 will be blown, but the first filter capacitor C1, the second filter capacitor C2 and the capacitor C3 to be discharged will not be affected, and other parts of the circuit will not be affected accordingly.
The case where the second discharge switch M2 is short-circuited is the same as above.
When the first filter capacitor C1 or the capacitor C3 to be discharged is short-circuited and the second discharge switch M2 is turned on, the current transformer can detect an overcurrent signal.
When any one of the first discharging switch M1, the second discharging switch M2, the first filter capacitor C1, the second filter capacitor C2, the resistor R1, the capacitor R2 and the resistor R3 is open-circuited, discharging cannot be completed, the condition can be detected by the current transformer, and then the control circuit can make fault information such as error reporting according to a strategy.
Fig. 4 is a schematic structural diagram of a discharge circuit according to another embodiment of the present invention. As shown in fig. 4, the discharge circuit further includes: a third filter capacitor C4 and a fourth filter capacitor C5, wherein the third filter capacitor C4 and the fourth filter capacitor C5 are connected in series and then connected in parallel with the capacitor C3 to be discharged; the discharge switch circuit is used for controlling the capacitor C3 to be discharged to discharge to the fourth filter capacitor C5 and discharge to the third filter capacitor C4 at the same time, or controlling the capacitor to be discharged to discharge to the third filter capacitor C4 and discharge to the fourth filter capacitor C5 at the same time.
Specifically, the working modes of the third filter capacitor C4 and the fourth filter capacitor C5 are similar to the working modes of the first filter capacitor C1 and the second filter capacitor C2, and are not described herein again. By adding the third filter capacitor C4 and the fourth filter capacitor C5, the discharge circuit can have a spare set of discharge periods, and the reliability is higher.
Correspondingly, the discharge switch circuit further includes a third discharge switch M3 connected in parallel with the third filter capacitor C4, and a fourth discharge switch M4 connected in parallel with the fourth filter capacitor C5, wherein when the third discharge switch M3 is turned on and the fourth discharge switch M4 is turned off, the capacitor C3 to be discharged discharges to the fourth filter capacitor C5, and the third filter capacitor C4 discharges through the third discharge switch M3; when the fourth discharging switch M4 is turned on and the third discharging switch M3 is turned off, the capacitor C3 to be discharged discharges to the third filter capacitor C4, and at the same time, the fourth filter capacitor C5 discharges through the fourth discharging switch M4. When the third discharging switch M3 and the fourth discharging switch M4 are turned off at the same time, the capacitor C3 to be discharged discharges to the third filter capacitor C4 and the fourth filter capacitor C5 at the same time.
The third and fourth discharge switches M3 and M4 operate in a similar manner to the first and second discharge switches M1 and M2, and are not described in detail herein.
The invention also provides two connection modes of the current transformer corresponding to the embodiment of fig. 4, as follows:
fig. 5A is a schematic structural diagram of a discharge circuit according to another embodiment of the present invention. As shown in fig. 5A, the discharge circuit further includes: one end of the first discharging switch M1 is connected with the second discharging switch M2, the other end of the first discharging switch M1 is connected with the second current transformer L2 of the second filtering capacitor C2, one end of the third discharging switch M3 is connected with the fourth discharging switch M4, the other end of the third discharging switch is connected with the third filtering capacitor C4 and the third current transformer L3 of the fourth filtering capacitor C5, and the second current transformer L2 and the third current transformer L3 are used for collecting discharging current signals.
Fig. 5B is a schematic structural diagram of a discharge circuit according to another embodiment of the present invention. As shown in fig. 5B, the discharge circuit further includes: and the fourth current transformer L4 is connected with the first discharging switch M1 and the second discharging switch M2 at one end, and is connected with the third filter capacitor C4 and the fourth filter capacitor C5 at the other end, and is used for collecting discharging current signals.
In the present embodiment, a temperature sensor may also be provided to detect the temperature in the vicinity of the first discharge switch M1, the second discharge switch M2, the third discharge switch M3, and the fourth discharge switch M4 in order to control the on/off of the first discharge switch M1, the second discharge switch M2, the third discharge switch M3, and the fourth discharge switch M4 as described above. The second current transformer L2, the third current transformer L3, and the fourth current transformer L4 provided in fig. 5A and 5B operate in a similar manner to the first current transformer L1, and are not described again here.
In summary, the discharge circuit of the present invention uses fewer devices, does not require a large amount of space, and can discharge safely and reliably.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A discharge circuit, comprising:
a first filter capacitor, a second filter capacitor and a discharge switch circuit, wherein,
the first filter capacitor and the second filter capacitor are connected in series and then connected in parallel with a capacitor to be discharged;
the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the second filter capacitor and discharge to the first filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the first filter capacitor and discharge to the second filter capacitor at the same time.
2. The discharge circuit of claim 1, wherein the discharge switch circuit comprises:
a first discharge switch connected in parallel with the first filter capacitor, a second discharge switch connected in parallel with the second filter capacitor, wherein,
when the first discharging switch is turned on and the second discharging switch is turned off, the capacitor to be discharged discharges to the second filter capacitor, and meanwhile, the first filter capacitor discharges through the first discharging switch;
when the second discharging switch is turned on and the first discharging switch is turned off, the capacitor to be discharged discharges to the first filter capacitor, and meanwhile, the second filter capacitor discharges through the second discharging switch.
3. The discharge circuit of claim 2, wherein when the first discharge switch and the second discharge switch are turned off at the same time, the capacitor to be discharged is discharged to the first filter capacitor and the second filter capacitor at the same time.
4. The discharge circuit of claim 1, further comprising:
a third filter capacitor, and a fourth filter capacitor, wherein,
the third filter capacitor and the fourth filter capacitor are connected in series and then connected in parallel with the capacitor to be discharged;
the discharge switch circuit is used for controlling the capacitor to be discharged to discharge to the fourth filter capacitor and discharge to the third filter capacitor at the same time, or controlling the capacitor to be discharged to discharge to the third filter capacitor and discharge to the fourth filter capacitor at the same time.
5. The discharge circuit of claim 4, wherein the discharge switch circuit further comprises a third discharge switch in parallel with the third filter capacitor, a fourth discharge switch in parallel with the fourth filter capacitor, wherein,
when the third discharge switch is turned on and the fourth discharge switch is turned off, the capacitor to be discharged discharges to the fourth filter capacitor, and meanwhile, the third filter capacitor discharges through the third discharge switch;
when the fourth discharging switch is turned on and the third discharging switch is turned off, the capacitor to be discharged discharges to the third filter capacitor, and meanwhile, the fourth filter capacitor discharges through the fourth discharging switch.
6. The discharge circuit of claim 5, wherein when the third discharge switch and the fourth discharge switch are turned off at the same time, the capacitor to be discharged is discharged to the third filter capacitor and the fourth filter capacitor at the same time.
7. The discharge circuit of claim 2, further comprising:
one end of the first current transformer is connected with the first discharging switch and the second discharging switch, and the other end of the first current transformer is connected with the first filter capacitor and the second filter capacitor and used for collecting discharging current signals.
8. The discharge circuit of claim 5, further comprising:
one end of the first current transformer is connected with the first discharging switch, the other end of the first current transformer is connected with the second discharging switch, the other end of the first current transformer is connected with the first filter capacitor, one end of the second current transformer is connected with the second filter capacitor, one end of the third current transformer is connected with the third discharging switch, the other end of the fourth current transformer is connected with the third filter capacitor, and the third current transformer is used for collecting discharging current signals.
9. The discharge circuit of claim 5, further comprising:
and one end of the fourth current transformer is connected with the first discharge switch and the second discharge switch, and the other end of the fourth current transformer is connected with the third filter capacitor and the fourth filter capacitor and is used for collecting discharge current signals.
10. The discharge circuit of claim 4 wherein said first filter capacitor, said second filter capacitor, said third filter capacitor and said fourth filter capacitor are high voltage filter capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911404491.5A CN113131595B (en) | 2019-12-30 | 2019-12-30 | Discharge circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911404491.5A CN113131595B (en) | 2019-12-30 | 2019-12-30 | Discharge circuit |
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| CN113131595A true CN113131595A (en) | 2021-07-16 |
| CN113131595B CN113131595B (en) | 2022-11-25 |
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| CN113131595B (en) | 2022-11-25 |
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Effective date of registration: 20230403 Address after: 221300 New energy automobile industrial park on the north side of Binhu Avenue and the west side of Taihu Avenue, High-tech Zone, Pizhou City, Xuzhou City, Jiangsu Province Patentee after: Honeycomb Drive Technology Pizhou Co.,Ltd. Address before: 071000 in No.75 Dongsheng Road, Lianchi District, Baoding City, Hebei Province Patentee before: Baoding R & D branch of honeycomb transmission system (Jiangsu) Co.,Ltd. |