CN219697487U - Control circuit for capacitor voltage discharge - Google Patents
Control circuit for capacitor voltage discharge Download PDFInfo
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- CN219697487U CN219697487U CN202223562233.XU CN202223562233U CN219697487U CN 219697487 U CN219697487 U CN 219697487U CN 202223562233 U CN202223562233 U CN 202223562233U CN 219697487 U CN219697487 U CN 219697487U
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- 239000003990 capacitor Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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Abstract
The utility model discloses a control circuit for capacitor voltage discharge, which comprises a control sub-circuit and a discharge sub-circuit, wherein the input end of the control sub-circuit is connected with a power supply voltage, the output end of the control sub-circuit is connected with the input end of the discharge sub-circuit, and the output end of the discharge sub-circuit is grounded. The control sub-circuit controls the on-off of the bleeder sub-circuit according to the state of the power supply voltage: when the power supply voltage is in a power supply state, the control sub-circuit is electrified, so that the bleeder sub-circuit is in an off state; when the power supply voltage is in a power-off state, the control sub-circuit is powered off, so that the bleeder sub-circuit is in a conducting state. The utility model can realize the discharge of the capacitor voltage by judging the state of the power supply voltage, does not need the participation of driving signals in the whole process, and ensures the stability and the reliability, thereby improving the safety.
Description
Technical Field
The utility model relates to the technical field of circuit control, in particular to a control circuit for capacitor voltage discharge.
Background
In the circuit, the capacitor plays a role in storing voltage, so that the voltage on the capacitor is always higher, and if the capacitor cannot be timely discharged, hidden danger in the aspect of personal safety exists. In the prior art, a semiconductor switching device and a bleeder resistor are generally connected in series and used as a bleeder branch, and whether the capacitive energy is bleeder is realized through the connection and disconnection of the semiconductor switching device.
As shown in fig. 1, switching devices Q1 and R1 are connected in series as a bleed branch of the high voltage capacitor C1. The on/off of Q1 is controlled by a connected drive circuit, which operates according to a control signal from the controller. One disadvantage of this circuit is that the operation of the controller depends on the presence of a power supply; when the high-voltage capacitor C1 is fully charged, a power-off condition (such as a power line or a battery fails) occurs, at this time, the power supply voltage disappears, the controller cannot work, an incorrect control signal can be given to the driving circuit, that is, the on-off of the Q1 cannot be controlled, and the energy on the high-voltage capacitor C1 cannot be discharged, which is a dangerous factor. For example, in maintenance, if the capacitor has high voltage, electric shock is easy to occur when a maintenance person opens the shell, so that the safety is not guaranteed, and the capacitor is very dangerous.
Disclosure of Invention
Aiming at the problem that the switching device in the prior art needs to rely on a driving signal to cause lower safety of capacitor voltage discharge, the utility model provides a control circuit for capacitor voltage discharge, the capacitor voltage discharge is controlled by the existence of a power supply voltage, no driving signal is needed, and the reliability and the safety are improved.
The control circuit for capacitor voltage discharge comprises a control sub-circuit and a discharge sub-circuit, wherein the control sub-circuit controls the on-off of the discharge sub-circuit according to the state of power supply voltage;
when the power supply voltage is in a power supply state, the control sub-circuit is electrified, so that the bleeder sub-circuit is in an off state; when the power supply voltage is in a power-off state, the control sub-circuit is powered off, so that the bleeder sub-circuit is in a conducting state.
Preferably, the input end of the control sub-circuit is connected with the power supply voltage, the output end of the control sub-circuit is connected with the input end of the bleeder sub-circuit, and the output end of the bleeder sub-circuit is grounded.
Preferably, the bleeder sub-circuit comprises a first switching element:
the collector of the first switch element is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a first capacitor, and the other end of the first capacitor and the emitter of the first switch element are connected in parallel and then grounded; the base of the first switching element is connected to one end of the second resistor.
Preferably, the bleeder sub-circuit further comprises a first diode:
the positive pole of the first diode is connected with the emitter of the first switching element, and the negative pole of the first diode is connected with the other end of the second resistor.
Preferably, the control sub-circuit includes a second switching element:
the power supply is respectively connected with the anode of the second diode and one end of the seventh resistor; the negative electrode of the second diode is connected with one end of a fourth resistor, the other end of the fourth resistor is respectively connected with one end of a second capacitor and one end of a third resistor, and the other end of the second capacitor is grounded; the other end of the third resistor, the source electrode of the second switching element and one end of the fifth resistor are connected in parallel and then connected with the other end of the second resistor;
the other end of the seventh resistor is connected with one end of the sixth resistor and the grid electrode of the second switching element respectively, and the other end of the sixth resistor, the drain electrode of the second switching element and the other end of the fifth resistor are connected in parallel and then grounded.
Preferably, the discharging time of the second capacitor is longer than the discharging time of the first capacitor.
In summary, due to the adoption of the technical scheme, compared with the prior art, the utility model has at least the following beneficial effects:
the state of the power supply voltage is judged through the control sub-circuit, and when the power supply voltage supplies power, the switch of the bleeder sub-circuit is controlled to be disconnected, so that the capacitor voltage is ensured not to be misplaced; when the power supply voltage is powered off, the switch of the bleeder subcircuit is controlled to be turned on, and the capacitor voltage starts to be bleeder. The utility model can realize the discharge of the capacitor voltage by judging the state of the power supply voltage, does not need the participation of driving signals in the whole process, and ensures the stability and the reliability, thereby improving the safety.
Description of the drawings:
fig. 1 is a schematic diagram of a control circuit for capacitor voltage bleed-off in the prior art.
Fig. 2 is a schematic diagram of a control circuit for capacitor voltage bleed according to an exemplary embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to examples and embodiments. It should not be construed that the scope of the above subject matter of the present utility model is limited to the following embodiments, and all techniques realized based on the present utility model are within the scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
As shown in fig. 2, the utility model provides a control circuit for capacitor voltage bleeder, which comprises a control sub-circuit and a bleeder sub-circuit, wherein the input end of the control sub-circuit is connected with a power supply voltage, the output end of the control sub-circuit is connected with the input end of the bleeder sub-circuit, and the output end of the bleeder sub-circuit is grounded.
In this embodiment, the control sub-circuit controls the on-off of the bleeder sub-circuit according to the state of the power supply voltage. When the power supply voltage is in a power supply state, the control sub-circuit is electrified, so that the bleeder sub-circuit is in an off state; when the power supply voltage is in a power-off state, the control sub-circuit is powered off, so that the bleeder sub-circuit is in a conducting state.
In this embodiment, the bleeder sub-circuit includes a first switching element Q1, Q1 including, but not limited to, a transistor:
the collector of the first switching element Q1 is connected with one end of a first resistor R1, the other end of the first resistor R1 is connected with one end of a first capacitor C1, and the other end of the first capacitor C1 and the emitter of the first switching element Q1 are connected in parallel and then grounded; the base of the first switching element Q1 is connected to one end of the second resistor R2.
In this embodiment, the first diode D1 is further included to protect Q1:
the positive pole of first diode D1 is connected with the projecting pole of Q1, and the negative pole of first diode D1 is connected with the other end of second resistance R2.
In this embodiment, the control sub-circuit includes a second switching element Q2, Q2 including but not limited to a field effect transistor:
the power supply voltage Vcc is respectively connected with the anode of the second diode D2 and one end of a seventh resistor R7; the cathode of the second diode D2 is connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is respectively connected with one end of a second capacitor C2 and one end of a third resistor R3, and the other end of the second capacitor C2 is grounded; the other end of the third resistor R3, the source electrode of the second switching element Q2 and one end of the fifth resistor R5 are connected in parallel and then connected with the other end of the second resistor R2;
the other end of the seventh resistor R7 is connected to one end of the sixth resistor R6 and the gate of the second switching element Q2, and the other end of the sixth resistor R6, the drain of the second switching element Q2, and the other end of the fifth resistor R5 are connected in parallel and then grounded.
In this embodiment, the working principle of the control circuit is as follows:
when the power supply is in a power state, for example vcc=15v, q2 is on, and C2 starts charging until saturation; when Q2 is on, the other end of R2 is equivalent to grounding, namely no current passes through R2, Q1 cannot be on and is in an off state, and energy on C1 cannot be leaked by mistake when the control circuit starts to work.
When the power supply is in a power-off state, for example vcc=0v, Q2 is turned off, C2 starts to discharge, after R3 and R5 are divided, current reaches Q1 through R2, Q1 is in a conductive state, and energy on C1 starts to be discharged.
In this embodiment, to ensure that the energy discharge on C1 is complete, the discharge time of C2 (i.e. the time to maintain Q1 on) should be longer than the discharge time of C1.
For example, when c2×r3+r5> c1×r1, the discharge time of C2 can be made longer than the discharge time of C1, ensuring that the energy discharge on C1 is complete.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.
Claims (3)
1. The control circuit for capacitor voltage discharge is characterized by comprising a control sub-circuit and a discharge sub-circuit, wherein the control sub-circuit controls the on-off of the discharge sub-circuit according to the state of power supply voltage;
the input end of the control sub-circuit is connected with the power supply voltage, the output end of the control sub-circuit is connected with the input end of the bleeder sub-circuit, and the output end of the bleeder sub-circuit is grounded;
when the power supply voltage is in a power supply state, the control sub-circuit is electrified, so that the bleeder sub-circuit is in an off state; when the power supply voltage is in a power-off state, the control sub-circuit loses power, so that the bleeder sub-circuit is in a conducting state;
the bleeder sub-circuit comprises a first switching element:
the collector of the first switch element is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a first capacitor, and the other end of the first capacitor and the emitter of the first switch element are connected in parallel and then grounded; the base electrode of the first switching element is connected with one end of the second resistor;
the control sub-circuit includes a second switching element:
the power supply is respectively connected with the anode of the second diode and one end of the seventh resistor; the negative electrode of the second diode is connected with one end of a fourth resistor, the other end of the fourth resistor is respectively connected with one end of a second capacitor and one end of a third resistor, and the other end of the second capacitor is grounded; the other end of the third resistor, the source electrode of the second switching element and one end of the fifth resistor are connected in parallel and then connected with the other end of the second resistor;
the other end of the seventh resistor is connected with one end of the sixth resistor and the grid electrode of the second switching element respectively, and the other end of the sixth resistor, the drain electrode of the second switching element and the other end of the fifth resistor are connected in parallel and then grounded.
2. A control circuit for capacitive voltage bleed-off as in claim 1, wherein said bleed-off sub-circuit further comprises a first diode:
the positive pole of the first diode is connected with the emitter of the first switching element, and the negative pole of the first diode is connected with the other end of the second resistor.
3. A control circuit for capacitor voltage bleed-off as in claim 1 wherein the second capacitor has a discharge time greater than the first capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223562233.XU CN219697487U (en) | 2022-12-30 | 2022-12-30 | Control circuit for capacitor voltage discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223562233.XU CN219697487U (en) | 2022-12-30 | 2022-12-30 | Control circuit for capacitor voltage discharge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219697487U true CN219697487U (en) | 2023-09-15 |
Family
ID=87970372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223562233.XU Active CN219697487U (en) | 2022-12-30 | 2022-12-30 | Control circuit for capacitor voltage discharge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219697487U (en) |
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2022
- 2022-12-30 CN CN202223562233.XU patent/CN219697487U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: Room 1103, 11th Floor, No. 2 Wanshou Road, Nan'an District, Chongqing, 400060 Patentee after: Huohuo Medical Equipment (Chongqing) Co.,Ltd. Country or region after: China Address before: 400084 room 6-1, building 1, No. 104, Cuibai Road, Dadukou District, Chongqing Patentee before: Chongqing pharmaceutical group Schiller Medical Equipment Co.,Ltd. Country or region before: China |