CN210669887U - Constant-power type rapid discharge circuit - Google Patents
Constant-power type rapid discharge circuit Download PDFInfo
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- CN210669887U CN210669887U CN201921673592.8U CN201921673592U CN210669887U CN 210669887 U CN210669887 U CN 210669887U CN 201921673592 U CN201921673592 U CN 201921673592U CN 210669887 U CN210669887 U CN 210669887U
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Abstract
The utility model discloses a constant power type rapid discharge circuit, which comprises a discharge switch tube and a discharge drive circuit; the discharge driving circuit comprises a discharge end Vout voltage value detection circuit, a reference voltage source and a comparison control circuit, wherein the voltage value detection circuit and the reference voltage source are respectively input to the input end of the comparison control circuit, the output end of the comparison control circuit is connected with the control end of the discharge switch tube, when the output of the voltage value detection circuit is larger than the reference voltage source, the discharge switch tube is controlled to discharge with small current, and when the output of the voltage value detection circuit is smaller than the reference voltage source, the discharge switch tube is controlled to discharge with large current. The utility model discloses in, through introducing output voltage and current feedback, the power of control switch pipe maintains and is close invariable. In the early stage of discharge, the voltage is higher, and the current flowing through the control MOS is very small; in the later stage of discharge, the voltage is lower, the current flowing through the control MOS is very large, and the total power of the discharged MOS tube can be effectively balanced.
Description
Technical Field
The utility model relates to a constant power type quick discharge circuit.
Background
The capacitor stores energy when the voltage is available, and the energy of the capacitor needs to be quickly consumed and released in some cases. One method is to combine a resistor on a capacitor and consume energy by utilizing the heating of the resistor, and the other method is to control the current of the MOS so that the MOS tube works in a constant current state to realize discharge. The two discharge forms have the advantages that in the early stage of discharge, the voltage is very high, the power of the resistor or the MOS tube is the maximum, in order to realize rapid discharge, the high-power resistor or the MOS tube must be selected, in the later stage of discharge, the voltage is reduced, the discharge power is smaller and smaller, and the discharge speed is slower and slower. The user's needs cannot be satisfied.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to present discharge circuit discharge power in the early stage of discharging the biggest, discharge power in the later stage of discharging is more and more littleer, and the speed of discharging is more and more slow. Can not meet the requirement of a user, and provides a constant-power type rapid discharge circuit.
The utility model adopts the technical proposal that: a constant-power type fast discharge circuit comprises a discharge switch tube, wherein two ends of the discharge switch tube are respectively connected with a discharge end Vout and the ground; the control end of the discharge switch tube is connected with the discharge driving circuit; the discharge driving circuit comprises a discharge end Vout voltage value detection circuit, a reference voltage source and a comparison control circuit, wherein the voltage value detection circuit and the reference voltage source are respectively input to the input end of the comparison control circuit, the output end of the comparison control circuit is connected with the control end of the discharge switch tube, when the output of the voltage value detection circuit is larger than the reference voltage source, the discharge switch tube is controlled to discharge with small current, and when the output of the voltage value detection circuit is smaller than the reference voltage source, the discharge switch tube is controlled to discharge with large current.
The utility model discloses in, through introducing output voltage and current feedback, the power of control switch pipe maintains and is close invariable. In the early stage of discharge, the voltage is higher, and the current flowing through the control MOS is very small; in the later stage of discharge, the voltage is lower, the current flowing through the control MOS is very large, and the total power of the discharged MOS tube can be effectively balanced.
Further, in the constant power type fast discharge circuit described above: the discharge switch tube is a MOS tube Q1, the D, S pole of the MOS tube Q1 is respectively connected with the discharge end Vout and the ground, and the G pole is connected with the output end of the discharge drive circuit.
Further, in the constant power type fast discharge circuit described above: the voltage value detection circuit comprises a current detection resistor R5, and the current detection resistor R5 is connected between the S pole of the MOS transistor Q1 and the ground.
Further, in the constant power type fast discharge circuit described above: the comparison control circuit comprises an operational amplifier U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1;
the common end of the current detection resistor R5 connected with the S pole of the MOS transistor Q1 is connected with the inverting input end of the operational amplifier U1A through a resistor R2, and the Vref of the reference voltage source is connected with the non-inverting input end of the operational amplifier U1A;
the capacitor C1 is connected between the inverting input end and the output end of the operational amplifier U1A;
the output end of the operational amplifier U1A is connected with the G pole of the MOS transistor Q1 through a resistor R3;
the resistor R1 is arranged between the inverting input end of the operational amplifier U1A and the electric end Vout;
resistor R4 is provided between the common terminal of current sensing resistor R5 connected to the S-pole of MOS transistor Q1 and the G-pole of MOS transistor Q1.
The present invention will be described in more detail with reference to the accompanying drawings and examples.
Drawings
Fig. 1 is a schematic diagram of embodiment 1 of the present invention.
Detailed Description
According to the virtual short and virtual break principle of the operational amplifier. The voltage of the pin 2 of the operational amplifier U1A is equal to the voltage of the pin 1 (the voltages at the non-inverting input terminal and the inverting input terminal are equal), and is the reference voltage Vref. Assuming that the current flowing through the resistor R1 is I1, I1 is calculated as (Vout-Vref)/R1.
Since the 2-pin of the operational amplifier U1A has no current due to the virtual short break principle of the operational amplifier, the current flowing through the resistor R2 is equal to the current flowing through the resistor R1, I1, and the voltage V5 is calculated to be Vref-R2I 1 assuming that the voltage across the resistor R5 is V5.
Assuming that the current flowing through R5 is I5, I5 can be calculated as V5/R5.
If the current flowing through the MOS transistor is I, I5-I1 can be calculated.
If the voltage across the MOS transistor is V, V can be calculated as Vout-V5.
If the total power of the MOS during discharging is P, P is calculated as V I.
The embodiment is a constant power type fast discharge circuit, which comprises a switch tube Q1 for controlling discharge and a current detection resistor R5, wherein the drain of the switch tube Q1 is connected with an output voltage Vout, and the source of the switch tube Q1 is connected with a resistor R5 between the ground. The high-voltage power amplifier further comprises an amplifying circuit composed of an operational amplifier, the same-direction input end of the operational amplifier U1A is connected with a reference voltage Vref, a resistor R1 is arranged between the reverse input end of the operational amplifier U1A and the output voltage Vout, a capacitor C1 is arranged between the reverse input end and the output end of the operational amplifier U1A, and a resistor R2 is arranged between the reverse input end of the operational amplifier U1A and the source stage of the switching tube Q1. The output end of the operational amplifier U1A is connected with the indirect resistor R3 of the grid electrode of the switching tube Q1, and the resistor R4 is connected between the grid electrode of the switching tube Q1 and the ground. The utility model provides a constant power type quick discharge circuit.
As shown in fig. 1, the constant power fast discharge circuit of this embodiment includes a switch Q1 for controlling discharge and a current-sensing resistor R5, wherein a drain of the switch Q1 is connected to an output voltage Vout, and a source of the switch Q1 is connected to a ground via a resistor R5. The high-voltage power amplifier further comprises an amplifying circuit composed of an operational amplifier, the same-direction input end of the operational amplifier U1A is connected with a reference voltage Vref, a resistor R1 is arranged between the reverse input end of the operational amplifier U1A and the output voltage Vout, a capacitor C1 is arranged between the reverse input end and the output end of the operational amplifier U1A, and a resistor R2 is arranged between the reverse input end of the operational amplifier U1A and the source stage of the switching tube Q1. The output end of the operational amplifier U1A is connected with the indirect resistor R3 of the grid electrode of the switching tube Q1, and the resistor R4 is connected between the grid electrode of the switching tube Q1 and the ground.
The constant power type fast discharge circuit of the present embodiment includes a switching tube Q1. The switch tube can be a controllable semiconductor such as MOS, IGBT, triode or silicon controlled rectifier according to the actual requirement.
The whole circuit has simple structure and clear principle.
Claims (4)
1. A constant-power type fast discharge circuit comprises a discharge switch tube, wherein two ends of the discharge switch tube are respectively connected with a discharge end Vout and the ground; the control end of the discharge switch tube is connected with the discharge driving circuit; the method is characterized in that: the discharge driving circuit comprises a discharge end Vout voltage value detection circuit, a reference voltage source and a comparison control circuit, wherein the voltage value detection circuit and the reference voltage source are respectively input to the input end of the comparison control circuit, the output end of the comparison control circuit is connected with the control end of the discharge switch tube, when the output of the voltage value detection circuit is larger than the reference voltage source, the discharge switch tube is controlled to discharge with small current, and when the output of the voltage value detection circuit is smaller than the reference voltage source, the discharge switch tube is controlled to discharge with large current.
2. The constant power type fast discharge circuit according to claim 1, wherein: the discharge switch tube is a MOS tube Q1, the D, S pole of the MOS tube Q1 is respectively connected with the discharge end Vout and the ground, and the G pole is connected with the output end of the discharge drive circuit.
3. The constant power type fast discharge circuit according to claim 2, wherein: the voltage value detection circuit comprises a current detection resistor R5, and the current detection resistor R5 is connected between the S pole of the MOS transistor Q1 and the ground.
4. The constant power type fast discharge circuit according to claim 3, wherein: the comparison control circuit comprises an operational amplifier U1A, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a capacitor C1;
the common end of the current detection resistor R5 connected with the S pole of the MOS transistor Q1 is connected with the inverting input end of the operational amplifier U1A through a resistor R2, and the Vref of the reference voltage source is connected with the non-inverting input end of the operational amplifier U1A;
the capacitor C1 is connected between the inverting input end and the output end of the operational amplifier U1A;
the output end of the operational amplifier U1A is connected with the G pole of the MOS transistor Q1 through a resistor R3;
the resistor R1 is arranged between the inverting input end of the operational amplifier U1A and the electric end Vout;
resistor R4 is provided between the common terminal of current sensing resistor R5 connected to the S-pole of MOS transistor Q1 and the G-pole of MOS transistor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921673592.8U CN210669887U (en) | 2019-10-07 | 2019-10-07 | Constant-power type rapid discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921673592.8U CN210669887U (en) | 2019-10-07 | 2019-10-07 | Constant-power type rapid discharge circuit |
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| Publication Number | Publication Date |
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| CN210669887U true CN210669887U (en) | 2020-06-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921673592.8U Active CN210669887U (en) | 2019-10-07 | 2019-10-07 | Constant-power type rapid discharge circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620498A (en) * | 2019-10-07 | 2019-12-27 | 深圳市金威源科技股份有限公司 | Constant-power type rapid discharge circuit |
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2019
- 2019-10-07 CN CN201921673592.8U patent/CN210669887U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620498A (en) * | 2019-10-07 | 2019-12-27 | 深圳市金威源科技股份有限公司 | Constant-power type rapid discharge circuit |
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