CN215897588U - Power supply circuit and power supply - Google Patents
Power supply circuit and power supply Download PDFInfo
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- CN215897588U CN215897588U CN202121589595.0U CN202121589595U CN215897588U CN 215897588 U CN215897588 U CN 215897588U CN 202121589595 U CN202121589595 U CN 202121589595U CN 215897588 U CN215897588 U CN 215897588U
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Abstract
The utility model discloses a power supply circuit and a power supply. The power supply circuit comprises a first switch, a second switch, a first resistor, a second resistor, a capacitor, a first timer, a first voltage detection unit and a control unit; the first switch is connected in series in the power supply loop, the capacitor is connected in parallel at two ends of the power supply, the second switch is connected in series with the first resistor and then connected in parallel with the first switch, and the second resistor is connected in parallel with the capacitor; the detection end and the signal output end of the first voltage detection unit are respectively connected with the capacitor and the control unit, the first timer is connected with the control unit, and the control ends of the first switch and the second switch are respectively connected with the control unit; the first timer is used for timing with fixed duration.
Description
Technical Field
The present invention relates to electronic circuit technologies, and in particular, to a power supply circuit and a power supply.
Background
The capacitor is taken as a key device in a high-voltage system of the electric vehicle, the performance of the capacitor directly influences the performance of the whole electric vehicle, wherein the most key parameter of the capacitor is the capacitor, the capacitor is arranged in parts of the electric vehicle, the capacitor is aged after being used for a long time, the capacitor is continuously reduced, the capacitor is subjected to capacity loss, the ESR (equivalent series resistance) of the capacitor is increased along with the capacity loss, the heat generated by the capacitor is increased along with the increase of the self heat, the capacity is continuously lost due to the rise of the temperature, positive circulation is formed, the capacity loss is accelerated, and finally the capacitor is damaged. Therefore, it is very meaningful to perform capacitance capacity detection on line during the operation of the whole vehicle, and once the capacitor is installed in each part, the capacity direct detection through the testing equipment becomes difficult.
Aiming at the problem that the capacitor is difficult to detect on line, the capacitor ESR presumed by measuring ripple voltage and ripple current at two ends of the capacitor in the prior art has the advantages of real-time measurement, the same defects are obvious, the cost is increased due to the fact that an additional current sensor is required to be added for current measurement, in addition, the measurement of the ripple voltage and the ripple current is easily influenced by the working condition and the electromagnetic interference of the electric vehicle, and the measurement precision is poor.
SUMMERY OF THE UTILITY MODEL
The utility model provides a power supply circuit and a power supply, which aim to improve the detection precision of the capacitance value of a bus capacitor.
In a first aspect, an embodiment of the present invention provides a power supply circuit, including a first switch, a second switch, a first resistor, a second resistor, a capacitor, a first timer, a first voltage detection unit, and a control unit;
the first switch is connected in series in a power supply loop, the capacitor is connected in parallel at two ends of a power supply, the second switch is connected in series with the first resistor and then connected in parallel with the first switch, and the second resistor is connected in parallel with the capacitor;
the detection end and the signal output end of the first voltage detection unit are respectively connected with the capacitor and the control unit, the first timer is connected with the control unit, and the control ends of the first switch and the second switch are respectively connected with the control unit;
the first timer is used for timing a fixed time length.
Furthermore, the device also comprises a third switch and a third resistor;
the third switch is connected with the third resistor in series and then connected with the capacitor in parallel, and the control end of the third switch is connected with the control unit;
the third resistor is used for discharging the capacitor.
Further, the device also comprises a second voltage detection unit and a second timer;
and the detection end and the signal output end of the second voltage detection unit are respectively connected with the third resistor and the control unit.
The second timer is connected with the control unit and is used for timing with fixed duration.
Furthermore, the device also comprises a fourth switch and a fourth resistor;
the fourth switch is connected with the fourth resistor in series and then connected with the capacitor in parallel, and the control end of the fourth switch is connected with the control unit.
Further, the device also comprises a voltage comparison unit, a second timer, a fifth switch, a fifth resistor and a sixth switch;
the fifth switch is connected with the fifth resistor in series and then connected with the capacitor in parallel;
a first input end and a second input end of the voltage comparison unit are respectively connected with the third resistor and the reference voltage end, and an output end of the voltage comparison unit is connected with a control end of the fifth switch through the sixth switch;
the control end of the sixth switch is connected with the control unit;
the second timer is connected with the control unit and is used for timing with fixed duration.
Further, the fourth switch adopts an MOS transistor or a triode.
Further, the fifth switch and the second switch adopt MOS transistors or triodes.
In a second aspect, an embodiment of the present invention further provides a power supply, including the power supply circuit described in the embodiment.
Compared with the prior art, the utility model has the beneficial effects that: the power supply circuit provided by the utility model is provided with a bus capacitor, a pre-charging resistor, a discharging resistor, a first timer, a first voltage detection unit and a control unit, wherein the first timer is used for timing a fixed time length, and the first voltage detection unit is used for collecting the voltage of the bus capacitor before and after the fixed time length. Based on the first timer, the control unit may determine the remaining capacity of the bus capacitor according to the voltage of the bus capacitor after a fixed time period. Because the fixed time length timed by the first timer is irrelevant to the change of the voltage of the bus capacitor, the deviation between the fixed time length obtained by the control unit and the actual fixed time length is small, and the control unit can accurately calculate the residual capacity of the bus capacitor.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit in an embodiment;
FIG. 2 is a schematic diagram of another power supply circuit configuration in the embodiment;
FIG. 3 is a schematic diagram of another power supply circuit in the embodiment;
fig. 4 is a schematic diagram of another power supply circuit in the embodiment.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a schematic diagram of a power circuit in an embodiment, and referring to fig. 1, the power circuit includes a first switch S1, a second switch S2, a first resistor R1, a second resistor R2, a capacitor C1, a first timer 100, a first voltage detecting unit 200, and a control unit 300.
The first switch S1 is connected in series in the power supply loop, the capacitor C1 is connected in parallel at two ends of the power supply, the second switch S1 is connected in series with the first resistor R1 and then connected in parallel with the first switch S1, and the second resistor R2 is connected in parallel with the capacitor C1.
The detection terminal and the signal output terminal of the first voltage detection unit 100 are respectively connected to the capacitor C1 and the control unit 300, the first timer 200 is connected to the control unit 300, and the control terminals of the first switch S1 and the second switch S2 are respectively connected to the control unit 300.
Illustratively, in this embodiment, the first switch S1 is used as a main power supply switch, the first resistor R1 is used as a pre-charge resistor, the capacitor C1 is used as a bus capacitor, and the second resistor R2 is used for discharging the capacitor C1 when the power supply is cut off.
For example, in the present embodiment, the first voltage detecting unit 200 is configured to detect the voltage of the capacitor C1 after the power supply is started, the first timer 100 is configured to time for a fixed time period, and the control unit 300 is configured to determine the capacitance value of the capacitor C1 according to the voltage variation of the capacitor C1 for the fixed time period after the power supply is started.
For example, in this embodiment, the operation process of the power supply circuit includes:
when the power supply is started, the control unit 300 controls the first switch S1 to be opened, the second switch S2 to be closed, and after the second switch S2 is closed, the capacitor C1 starts to be charged;
after controlling the second switch S2 to be closed, the control unit 300 controls the first timer 100 to start timing, and collects the current voltage of the capacitor C1 through the first voltage detection unit 200, which is denoted as U1;
after a fixed time period t, the first timer 100 stops timing, and after the first timer 100 stops timing, the control unit 300 collects the current voltage of the capacitor C1 through the first voltage detection unit 200, which is denoted as U2;
by using the values of the first resistor R1, the second resistor R2, the fixed time period t, the voltage U1 and the voltage U2, the control unit 300 calculates the current capacitance value of the capacitor C1 according to a capacitor charging formula.
Illustratively, the general form of the capacitive charge formula is:
in the formula of UtAfter charging for a time t, the voltage of the capacitor, U0Is the initial voltage of the capacitor, UsIs the power voltage, R is the charging resistance value, and C is the capacitance value of the capacitor.
In this embodiment, since the power circuit is configured with the first timer 100, and the first timer 100 is used for timing with a fixed duration, the control unit 300 may reversely estimate the capacitance value of the capacitor according to a capacitor charging formula, and referring to fig. 1, the formula for calculating the capacitance value of the capacitor is as follows:
in the above formula, t is the timing duration of the first timer 100, R1Is the resistance value of the first resistor R1, R2Is the value of the second resistor R2, UsIs the supply voltage.
For example, after each power supply is started, the control unit 300 calculates the capacitance value of the capacitor C1 once, and based on the calculated capacitance value, the control unit 300 may determine whether the remaining capacity of the capacitor C1 is within a predetermined interval range.
In this embodiment, the power supply circuit is configured with a bus capacitor, a pre-charge resistor, a discharge resistor, a first timer, a first voltage detection unit, and a control unit, where the first timer is used for timing a fixed duration, and the first voltage detection unit is used for collecting voltages of the bus capacitor before and after the fixed duration. Based on the first timer, the control unit may determine the remaining capacity of the bus capacitor according to the voltage of the bus capacitor after a fixed time period. Because the fixed time length timed by the first timer is irrelevant to the change of the voltage of the bus capacitor, the deviation between the fixed time length obtained by the control unit and the actual fixed time length is small, and the control unit can accurately calculate the residual capacity of the bus capacitor.
Example two
Fig. 2 is a schematic diagram of another power supply circuit in an embodiment, and referring to fig. 2, the power supply circuit further includes a third switch S3 and a third resistor R3 based on the scheme shown in fig. 1.
The third switch S3 is connected in series with the third resistor R3 and then connected in parallel with the capacitor C1, and the control terminal of the third switch S3 is connected to the control unit 300.
Illustratively, in this embodiment, the third resistor R3 is used for active discharge of the capacitor.
Referring to fig. 2, the operation of the power supply circuit includes:
after the power supply is powered off, the first voltage detection unit 200 collects the current voltage of the capacitor C1, and after the time is set, the control unit 300 judges whether the capacitor C1 is completely discharged according to the voltage value collected by the first voltage detection unit 200;
if the voltage of the capacitor C1 does not reach the voltage at the time of completion of discharging, the control unit 300 controls the third switch S3 to close, so that the capacitor C1 continues to discharge through the third resistor R3.
Illustratively, the discharge speed of the capacitor C1 can be improved by configuring the third resistor R3.
Fig. 3 is a schematic diagram of another power circuit structure in the embodiment, and referring to fig. 3, the power circuit may further include a second voltage detection unit 400 and a second timer 500.
And the detection end and the signal output end of the second voltage detection unit are respectively connected with the third resistor and the control unit.
The second timer is connected with the control unit and is used for timing with fixed duration.
Referring to fig. 3, the power circuit further includes a fourth switch S4 and a fourth resistor R4.
The fourth switch S4 is connected in series with the fourth resistor R4 and then connected in parallel with the capacitor C1, and the control terminal of the fourth switch S4 is connected to the control unit 300.
Optionally, in this embodiment, the fourth switch S4 employs a MOS transistor or a triode.
For example, in the present embodiment, the timing duration of the first timer 100 is different from that of the second timer 500.
Referring to fig. 3, the operation of the power supply circuit includes:
after the power supply is powered off, the control unit 300 controls the third switch S3 to be closed, so that the capacitor C1 discharges through the second resistor R2 and the third resistor R3;
after controlling the third switch S3 to close, the control unit 300 controls the second timer 500 to start timing;
after a fixed time period, the second timer 500 stops timing, and after the second timer 500 stops timing, the control unit 300 collects the current voltage of the third resistor R3 through the second voltage detection unit 400;
if the current voltage of the third resistor R3 does not reach the voltage at the time of completion of discharging, the control unit 300 controls the fourth switch S4 to close, so that the capacitor C1 continues to discharge through the fourth resistor R4.
Illustratively, by configuring the fourth resistor R4, the problem that the capacitor C1 cannot normally discharge when the second resistor R2 and the third resistor R3 fail can be avoided, and the discharge speed of the capacitor C1 can be further increased.
EXAMPLE III
Fig. 4 is a schematic diagram of another power circuit structure in the embodiment, and referring to fig. 4, on the basis of the scheme shown in fig. 2, the power circuit further includes a voltage comparison unit 600, a second timer 500, a fifth switch S5, a fifth resistor R5, and a sixth switch S6.
The fifth switch S5 is connected in series with the fifth resistor R5 and then connected in parallel with the capacitor C1;
the first input terminal and the second input terminal of the voltage comparison unit 600 are respectively connected to the third resistor R3 and the reference voltage terminal Vref, the output terminal of the voltage comparison unit 600 is connected to the control terminal of the fifth switch S5 through the sixth switch S6, and the control terminal of the sixth switch S6 is connected to the control unit 300.
The second timer 500 is connected to the control unit 300, and the second timer 500 is used for timing a fixed time length.
Referring to fig. 4, the operation of the power supply circuit includes:
after the power supply is powered off, the control unit 300 controls the third switch S3 to be closed, so that the capacitor C1 discharges through the second resistor R2 and the third resistor R3;
after controlling the third switch S3 to close, the control unit 300 controls the second timer 500 to start timing;
after a fixed time period, the second timer 500 stops timing, and after the second timer 500 stops timing, the control unit 300 controls the sixth switch S6 to close;
the voltage comparing unit 600 compares the current voltage of the third resistor R3 with the reference voltage, and if the current voltage of the third resistor R3 does not reach the voltage at the time of completion of discharging, the output signal of the voltage comparing unit 600 closes the fifth switch S5, so that the capacitor C1 continues to discharge through the fifth resistor R5.
Optionally, the fifth switch adopts a MOS transistor or a triode.
Illustratively, by configuring the fifth resistor R5, the problem that the capacitor C1 cannot normally discharge when the second resistor R2 and the third resistor R3 fail can be avoided, and the discharge speed of the capacitor C1 can be further increased.
Example four
The present embodiment provides a power supply including the power supply circuit described in any of the above embodiments, and the advantageous effects thereof are the same as those described in the corresponding embodiments.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A power supply circuit is characterized by comprising a first switch, a second switch, a first resistor, a second resistor, a capacitor, a first timer, a first voltage detection unit and a control unit;
the first switch is connected in series in a power supply loop, the capacitor is connected in parallel at two ends of a power supply, the second switch is connected in series with the first resistor and then connected in parallel with the first switch, and the second resistor is connected in parallel with the capacitor;
the detection end and the signal output end of the first voltage detection unit are respectively connected with the capacitor and the control unit, the first timer is connected with the control unit, and the control ends of the first switch and the second switch are respectively connected with the control unit;
the first timer is used for timing a fixed time length.
2. The power supply circuit of claim 1, further comprising a third switch, a third resistor;
the third switch is connected with the third resistor in series and then connected with the capacitor in parallel, and the control end of the third switch is connected with the control unit;
the third resistor is used for discharging the capacitor.
3. The power supply circuit according to claim 2, further comprising a second voltage detection unit, a second timer;
the detection end and the signal output end of the second voltage detection unit are respectively connected with the third resistor and the control unit;
the second timer is connected with the control unit and is used for timing with fixed duration.
4. The power supply circuit of claim 3, further comprising a fourth switch, a fourth resistor;
the fourth switch is connected with the fourth resistor in series and then connected with the capacitor in parallel, and the control end of the fourth switch is connected with the control unit.
5. The power supply circuit according to claim 2, further comprising a voltage comparing unit, a second timer, a fifth switch, a fifth resistor, a sixth switch;
the fifth switch is connected with the fifth resistor in series and then connected with the capacitor in parallel;
a first input end and a second input end of the voltage comparison unit are respectively connected with the third resistor and the reference voltage end, and an output end of the voltage comparison unit is connected with a control end of the fifth switch through the sixth switch;
the control end of the sixth switch is connected with the control unit;
the second timer is connected with the control unit and is used for timing with fixed duration.
6. The power supply circuit according to claim 4, wherein the fourth switch is a MOS transistor or a triode.
7. The power supply circuit according to claim 5, wherein the fifth switch is a MOS transistor or a triode.
8. A power supply comprising a power supply circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121589595.0U CN215897588U (en) | 2021-07-13 | 2021-07-13 | Power supply circuit and power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121589595.0U CN215897588U (en) | 2021-07-13 | 2021-07-13 | Power supply circuit and power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897588U true CN215897588U (en) | 2022-02-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121589595.0U Active CN215897588U (en) | 2021-07-13 | 2021-07-13 | Power supply circuit and power supply |
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|---|---|
| CN (1) | CN215897588U (en) |
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2021
- 2021-07-13 CN CN202121589595.0U patent/CN215897588U/en active Active
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