CN220775649U - Self-adaptive constant-current load circuit and power supply circuit - Google Patents
Self-adaptive constant-current load circuit and power supply circuit Download PDFInfo
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- CN220775649U CN220775649U CN202322262407.9U CN202322262407U CN220775649U CN 220775649 U CN220775649 U CN 220775649U CN 202322262407 U CN202322262407 U CN 202322262407U CN 220775649 U CN220775649 U CN 220775649U
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- 238000007599 discharging Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 4
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Abstract
The utility model relates to a self-adaptive constant-current load circuit and a power supply circuit, which can provide a self-adaptive constant-current load when a capacitor is required to be discharged, wherein the self-adaptive constant-current load circuit comprises a first constant-current circuit, a voltage sampling circuit and at least one second constant-current circuit; the first constant current circuit comprises a constant current control unit and a resistor R3; the voltage sampling circuit detects the capacitor voltage and controls the on and off of the second constant current circuit so as to control the resistance value of the constant current load setting resistor; the constant current value of the capacitor is small when the capacitor discharges at high voltage, and the constant current value is large when the capacitor discharges at low voltage, so that the switching tube Q1 is always in an optimal working interval. The utility model not only realizes that the constant current value can be increased along with the voltage drop when the output capacitor discharges when the output voltage is switched, and reduces the discharge time, but also does not influence the overall efficiency of the normal work of the product.
Description
Technical Field
The present utility model relates to the field of power electronics, and in particular, to a self-adaptive constant current load circuit and a power supply circuit
Background
In the practical application of the circuit, the input/output capacitor stores larger energy, and if the energy is not discharged during shutdown, the error electric shock can be caused to influence the next startup or the working state of the load-side circuit; if the output is adjusted from high voltage to low voltage in the output-adjustable product, if the energy is not discharged in time, the output cannot reach the normal setting voltage in time, and the operation of a client system is affected. In the industry, a dummy load is generally given to the output end for consumption or a constant current load is given to the output capacitor when the output end needs to be discharged, however, the dummy load design ensures that the product efficiency is low, the discharge time is short when the high voltage is output, the discharge time is long when the low voltage is output, and the requirements of the high and low voltage discharge time cannot be met; as shown in fig. 1, a schematic circuit diagram of a constant current load is adopted in the prior art, although the design of the constant current load can achieve full-voltage linear discharge, because the MOS transistor has smaller high-voltage power consumption and large low-voltage power consumption when working in a linear region, the power consumption which can be born by the whole MOS transistor is inversely proportional to the voltage difference, and the design needs to be designed according to the high voltage in order to be compatible with the high-voltage and low-voltage, so that the constant current load is smaller and the discharge time is long; therefore, an adaptive constant current load circuit and a power supply circuit are provided to overcome the problem.
Disclosure of Invention
In view of the above, the self-adaptive constant current load circuit and the power supply circuit provided by the utility model are applied to the two ends of the capacitor which needs to be discharged, and greatly optimize the discharging speed of the low-voltage section under the condition that the normal working efficiency of the product is not affected.
The technical scheme provided by the utility model is as follows:
in a first aspect, an adaptive constant current load circuit is provided, including a first constant current circuit, a voltage sampling circuit, and at least one second constant current circuit; the first constant current circuit comprises a constant current control unit and a resistor R3;
the first end of the constant current control unit is connected with the first end of the voltage sampling circuit and then is connected with the positive end of the discharge capacitor C0, the second end of the constant current control unit is used for accessing the control signal V1, and the third end of the constant current control unit is connected with one end of the resistor R3 and the first end of the second constant current circuit; the second end of the voltage sampling circuit is connected with the third end of the second constant current circuit, and the third end of the voltage sampling circuit is grounded; the second end of the second constant current circuit is used for accessing a reference signal, and the fourth end of the second constant current circuit is grounded;
the constant current control unit is used for controlling the constant current of the resistor R3 according to the control signal V1;
the voltage sampling circuit is used for collecting the voltage of the discharge capacitor C0 and generating a sampling signal V2;
the second constant current circuit is used for comparing the sampling signal V2 with the reference signal to generate a comparison result, and controlling the second constant current circuit to be conducted and connected into the first constant current circuit according to the comparison result.
Preferably, the reference signals to which the different second constant current circuits are connected are different.
Preferably, the second constant current circuit includes a resistor R6, a resistor R7, a switching tube Q2, and a comparator U2, wherein one end of the resistor R7 is used as a first end of the second constant current circuit, and is connected with a third end of the constant current control unit and one end of the resistor R3, the other end of the resistor R7 is connected with the first end of the switching tube Q2, a second end of the switching tube Q2 is used as a fourth end of the second constant current circuit and is connected with ground, a control end of the switching tube Q2 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with an output end of the comparator U2, a positive input end of the comparator U2 is used as a second end of the second constant current circuit and is used for being connected with a reference signal, and a negative input end of the comparator U2 is used as a third end of the second constant current circuit and is connected with a second end of the voltage sampling circuit.
Preferably, the comparison result includes a high level signal and a low level signal; the second constant current circuit is configured to compare the sampling signal V2 with the reference signal to generate a comparison result, and control itself to be turned on and connected to the first constant current circuit according to the comparison result, and specifically includes: the comparator U2 compares the sampling signal V2 with the reference signal, when the reference signal is larger than the sampling signal V2, a high-level signal is output to control the switching tube Q1 to be turned on, and when the reference signal is smaller than the sampling signal V2, a low-level signal is output to control the switching tube Q1 to be turned off.
Preferably, the constant current control unit includes a resistor R1, a resistor R2, a switching tube Q1, and a comparator U1, where a first end of the switching tube Q1 is used as a first end of the constant current control unit and is used to connect a positive end of the discharge capacitor C0, a second end of the switching tube Q1 is connected to a negative input end of the comparator U1 and then is used as a third end of the constant current control unit and is connected to one end of the resistor R3 and a first end of the second constant current circuit, one end of the resistor R1 is used as a second end of the constant current control unit and is used to access a control signal V1, the other end of the resistor R1 is connected to a positive input end of the comparator U1, an output end of the comparator U1 is connected to one end of the resistor R2, and one end of the resistor R2 is connected to a control end of the switching tube Q1.
Preferably, the voltage sampling circuit includes a resistor R4 and a resistor R5, one end of the resistor R4 is used as a first end of the voltage sampling circuit and is connected to a positive end of the discharge capacitor C0, the other end of the resistor R4 is connected to one end of the resistor R5 and then is used as a second end of the voltage sampling circuit and is connected to a second end of the second constant current circuit, and the other end of the resistor R5 is connected to the ground through a third end of the voltage sampling circuit.
In a second aspect, an adaptive constant current load circuit is provided, including a first constant current circuit, a voltage sampling circuit, and at least one second constant current circuit;
the first constant current circuit comprises a resistor R1, a resistor R2, a resistor R3, a switching tube Q1 and a comparator U1;
the second constant current circuit comprises a resistor R6, a resistor R7, a switching tube Q2 and a comparator U2;
the voltage sampling circuit comprises a resistor R4 and a resistor R5;
the first end of the switch tube Q1 is connected with one end of the resistor R4 and then is used for being connected with the positive end of the discharge capacitor C0, the second end of the switch tube Q1 is connected with the negative input end of the comparator U1, one end of the resistor R3 and one end of the resistor R7, the control end of the comparator U1 is connected with the output end of the comparator U1 through the resistor R2, the positive input end of the comparator U1 is connected with one end of the resistor R1, the other end of the resistor R1 is used for being connected with a control signal V1, the other end of the resistor R1 is connected with the positive input end of the comparator U1, the output end of the comparator U1 is connected with one end of the resistor R2, one end of the resistor R2 is connected with the control end of the switch tube Q1, the other end of the resistor R7 is connected with the first end of the switch tube Q2, the control end of the switch tube Q2 is connected with the output end of the comparator U2 through the resistor R6, the positive input end of the comparator U2 is used for being connected with a reference signal, the negative input end of the comparator U2 is connected with the other end of the resistor R4, one end of the resistor R5 is connected with the other end of the resistor R3, the other end of the resistor R5 is connected with the second end of the switch tube Q2 is connected with the ground.
In a third aspect, a power supply circuit is provided, which comprises a main power circuit provided with an output capacitor and/or an input capacitor, and at least one adaptive constant current load circuit as described above, wherein a first end of the first constant current circuit and a voltage sampling circuit are connected with a positive end of the output capacitor or the input capacitor.
Compared with the prior art, the utility model has the beneficial effects that: the utility model controls whether the second constant current circuit is connected with the first constant current circuit or not by sampling the voltage of the discharge capacitor, thereby controlling the whole constant current load value, and in the power consumption interval of the linear region of the switching tube, different constant current load values can be given to different voltage segments of the discharge capacitor, so that the constant current load value is continuously switched in the descending process of the capacitor voltage, the constant current value of the capacitor is small when the high voltage is discharged, the constant current value is large when the low voltage is discharged, the switching tube Q1 is always in the optimal working interval, the discharging time of the low voltage segment is greatly optimized, the constant current value can be increased along with the voltage reduction when the output capacitor is discharged when the output voltage is switched, the discharging time is reduced, and the whole efficiency of the normal work of the product is not influenced.
Drawings
Fig. 1 is a schematic diagram of a constant current load circuit commonly used in the industry.
Fig. 2 is a circuit diagram of the adaptive constant current load circuit according to the present utility model.
Fig. 3 is another circuit diagram of the adaptive constant current load circuit according to the present embodiment.
Fig. 4 is a current-voltage waveform diagram of the adaptive constant current load circuit according to the present embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present embodiment more apparent, the present embodiment will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present embodiments.
In this embodiment, as shown in fig. 2 and fig. 3, a circuit diagram of an adaptive constant current load circuit shown in this embodiment is provided, where the adaptive constant current load circuit includes a first constant current circuit, a voltage sampling circuit, and at least one second constant current circuit; the first constant current circuit comprises a constant current control unit and a resistor R3;
the first end of the constant current control unit is connected with the first end of the voltage sampling circuit and then is connected with the positive end of the discharge capacitor C0, the second end of the constant current control unit is used for accessing the control signal V1, and the third end of the constant current control unit is connected with one end of the resistor R3 and the first end of the second constant current circuit; the second end of the voltage sampling circuit is connected with the third end of the second constant current circuit, and the third end of the voltage sampling circuit is grounded; the second end of the second constant current circuit is used for accessing a reference signal, and the fourth end of the second constant current circuit is grounded;
the constant current control unit is used for controlling the constant current of the resistor R3 according to the control signal V1;
the voltage sampling circuit is used for collecting the voltage of the discharge capacitor C0 and generating a sampling signal V2;
the second constant current circuit is used for comparing the sampling signal V2 with the reference signal to generate a comparison result, and controlling the second constant current circuit to be conducted and connected into the first constant current circuit according to the comparison result.
Specifically, the current of the resistor R3 is controlled to be constant according to the control signal V1, so that a constant current load is provided for the discharge capacitor C0, whether the second constant current circuit is connected to the first constant current circuit or not is controlled by sampling the voltage of the discharge capacitor, so that the whole constant current load value is controlled, different constant current load values can be given to different voltage sections of the discharge capacitor in the power consumption interval of the switching tube linear region, the constant current load value is continuously switched in the falling process of the capacitor voltage, the constant current value of the low voltage section is larger than that of the high voltage section, and the discharge time of the low voltage section is greatly optimized.
Specifically, the control signal V1 and the reference signal are derived from logic signals in the circuit or are provided from the outside, and the control signal V1 gives a high level when the capacitor needs to be discharged, so that the normal operation maintains a low level; the reference signals connected to different second constant current circuits are different, namely, the voltage of the discharge capacitor C0 is different when the different second constant current circuits are connected to the first constant current circuit, when the second constant current circuits connected to the first constant current circuit are more, the load value of the constant current load provided by the self-adaptive constant current load circuit for the discharge capacitor C0 is smaller, and the current flowing through the constant current load is larger as the voltage of the constant current load is equal to the voltage of the control signal V1, so that the constant current load value is continuously switched in the capacitor voltage dropping process, the constant current value of the low voltage section is larger than that of the high voltage section, and the discharge time of the low voltage section is greatly optimized.
As a specific implementation manner of the second constant current circuit, the second constant current circuit includes a resistor R6, a resistor R7, a switching tube Q2, and a comparator U2, one end of the resistor R7 is used as a first end of the second constant current circuit, connected to a third end of the constant current control unit and one end of the resistor R3, the other end of the resistor R7 is connected to a first end of the switching tube Q2, a second end of the switching tube Q2 is used as a fourth end of the second constant current circuit, connected to ground, a control end of the switching tube Q2 is connected to one end of the resistor R6, the other end of the resistor R6 is connected to an output end of the comparator U2, a positive input end of the comparator U2 is used as a second end of the second constant current circuit and connected to a reference signal, and a negative input end of the comparator U2 is used as a third end of the second constant current circuit and connected to a second end of the voltage sampling circuit.
Specifically, the comparison result includes a high level signal and a low level signal; the second constant current circuit is configured to compare the sampling signal V2 with the reference signal to generate a comparison result, and control itself to be turned on and connected to the first constant current circuit according to the comparison result, and specifically includes: the comparator U2 compares the sampling signal V2 with the reference signal, when the reference signal is larger than the sampling signal V2, a high-level signal is output to control the switching tube Q1 to be turned on, and when the reference signal is smaller than the sampling signal V2, a low-level signal is output to control the switching tube Q1 to be turned off.
As a specific implementation manner of the constant current control unit, the constant current control unit includes a resistor R1, a resistor R2, a switching tube Q1, and a comparator U1, where a first end of the switching tube Q1 is used as a first end of the constant current control unit and is connected to a positive end of the discharge capacitor C0, a second end of the switching tube Q1 is connected to a negative input end of the comparator U1 and then is used as a third end of the constant current control unit, and is connected to one end of the resistor R3 and a first end of the second constant current circuit, one end of the resistor R1 is used as a second end of the constant current control unit and is used for accessing a control signal V1, the other end of the resistor R1 is connected to a positive input end of the comparator U1, an output end of the comparator U1 is connected to one end of the resistor R2, and one end of the resistor R2 is connected to a control end of the switching tube Q1.
As a specific embodiment of the voltage sampling circuit, the voltage sampling circuit includes a resistor R4 and a resistor R5, one end of the resistor R4 is used as a first end of the voltage sampling circuit and is connected to a positive end of the discharge capacitor C0, the other end of the resistor R4 is connected to one end of the resistor R5, and then is used as a second end of the voltage sampling circuit and is connected to a second end of the second constant current circuit, and the other end of the resistor R5 is connected to ground.
The connection relation of the components in this embodiment is specifically as follows:
the first end of the switch tube Q1 is connected with one end of the resistor R4 and then is used for being connected with the positive end of the discharge capacitor C0, the second end of the switch tube Q1 is connected with the negative input end of the comparator U1, one end of the resistor R3 and one end of the resistor R7, the control end of the comparator U1 is connected with the output end of the comparator U1 through the resistor R2, the positive input end of the comparator U1 is connected with one end of the resistor R1, the other end of the resistor R1 is used for being connected with a control signal V1, the other end of the resistor R1 is connected with the positive input end of the comparator U1, the output end of the comparator U1 is connected with one end of the resistor R2, one end of the resistor R2 is connected with the control end of the switch tube Q1, the other end of the resistor R7 is connected with the first end of the switch tube Q2, the control end of the switch tube Q2 is connected with the output end of the comparator U2 through the resistor R6, the positive input end of the comparator U2 is used for being connected with a reference signal, the negative input end of the comparator U2 is connected with the other end of the resistor R4, one end of the resistor R5 is connected with the other end of the resistor R3, the other end of the resistor R5 is connected with the second end of the switch tube Q2 is connected with the ground.
In one embodiment, the switching tube Q1 and the switching tube Q2 are enhancement type MOS tubes, the first ends of the switching tube Q1 and the switching tube Q2 are drain electrodes, the second ends are source electrodes, and the control ends are gate electrodes.
In one embodiment, the switching tube Q1 and the switching tube Q2 are NPN transistors, the first ends of the switching tube Q1 and the switching tube Q2 are collectors, the second ends are emitters, and the control ends are bases.
In one embodiment, the switching tube Q1 is an enhancement MOS tube or an NPN triode, when the switching tube Q1 is an enhancement MOS tube, the first end is a drain, the second end is a source, the control end is a gate, when the switching tube Q1 is an NPN triode, the first end is a collector, the second end is an emitter, and the control end is a base.
In one embodiment, the switching tube Q2 is an enhancement MOS tube or an NPN triode, when the switching tube Q2 is an enhancement MOS tube, the first end is a drain, the second end is a source, the control end is a gate, when the switching tube Q2 is an NPN triode, the first end is a collector, the second end is an emitter, and the control end is a base.
In the implementation process of this embodiment, the switching tube Q1 and the switching tube Q2 are enhancement type MOS tubes, the first ends of the switching tube Q1 and the switching tube Q2 are drain electrodes, the second ends are source electrodes, the control ends are gate electrodes, the switching tube Q1 is hereinafter referred to as a MOS tube Q1, and the switching tube Q2 is a MOS tube Q2.
Specifically, the discharge capacitor in this embodiment is an input capacitor and/or an output capacitor in a main power circuit of the power circuit, where the input capacitor is connected to an adaptive constant current load circuit, or the output capacitor is connected to an adaptive constant current load circuit, or both the input capacitor and the output capacitor are connected to an adaptive constant current load circuit.
The working principle of this embodiment is as follows:
as shown in fig. 4, in this embodiment, waveforms of capacitor voltage and constant current are simulated, when the control signal V1 gives a high level, the comparator U1 outputs the high level to control the switch tube Q1 to be turned on through the resistor R2, the voltage of the resistor R3 increases with the turn-on degree of the switch tube Q1 until the voltage on the resistor R3 is greater than the control signal V1, the comparator U1 tends to be turned off, the turn-on degree of the switch tube Q1 decreases, the current of the resistor R3 decreases, the voltage of the resistor R3 is smaller than the control signal V1, the comparator U1 tends to be turned on, the turn-on degree of the switch tube Q1 increases, so as to form negative feedback, finally, the current on the resistor R3 is constant, and finally, a constant current load is added to the discharge capacitor C0.
When the number of the second constant current circuits is 1, at this time, capacitor voltage (namely a sampling signal V2) is acquired by a resistor R4 and compared with a reference signal Vref1, when the capacitor voltage is reduced to a value that is smaller than the reference signal Vref1, a comparator U2 is opened, a switching tube Q2 is conducted, and the constant current resistor R3 of the constant current circuits is connected with a resistor R7 in parallel, so that the total constant current resistor is reduced, but the level of a control signal V1 is unchanged, the constant current value is increased, and the constant current value is increased when the capacitor voltage is low; similarly, when the number of the second constant current circuits is n, the nth second constant current circuit is connected with a reference signal Vrefn, the collected capacitor voltage is compared with different reference signals (reference signals Vref1 to Vrefn), when the capacitor voltage is reduced to a value smaller than the reference signal V2, a comparator U2 of the second constant current circuit corresponding to the reference signal is opened, a switching tube Q2 is conducted, and due to the fact that the reference signals of the different second constant current circuits are different, the adaptive constant current circuit can switch the load value of the constant current load for n times, so that the constant current value becomes larger in a lower voltage section, and discharge is faster, wherein n is an integer greater than or equal to 2.
The foregoing is illustrative of the preferred embodiments of the present utility model, and it should be noted that the foregoing is not to be construed as limiting the utility model, and that modifications and adaptations to those skilled in the art may be made without departing from the spirit and scope of the utility model, which is also intended to be covered by the appended claims.
Claims (8)
1. The self-adaptive constant current load circuit is characterized by comprising a first constant current circuit, a voltage sampling circuit and at least one second constant current circuit; the first constant current circuit comprises a constant current control unit and a resistor R3;
the first end of the constant current control unit is connected with the first end of the voltage sampling circuit and then is connected with the positive end of the discharge capacitor C0, the second end of the constant current control unit is used for accessing the control signal V1, and the third end of the constant current control unit is connected with one end of the resistor R3 and the first end of the second constant current circuit; the second end of the voltage sampling circuit is connected with the third end of the second constant current circuit, and the third end of the voltage sampling circuit is grounded; the second end of the second constant current circuit is used for accessing a reference signal, and the fourth end of the second constant current circuit is grounded;
the constant current control unit is used for controlling the constant current of the resistor R3 according to the control signal V1;
the voltage sampling circuit is used for collecting the voltage of the discharge capacitor C0 and generating a sampling signal V2;
the second constant current circuit is used for comparing the sampling signal V2 with the reference signal to generate a comparison result, and controlling the second constant current circuit to be conducted and connected into the first constant current circuit according to the comparison result.
2. The adaptive constant current load circuit of claim 1, wherein the reference signals to which the different second constant current circuits are connected are different.
3. The self-adaptive constant current load circuit according to claim 1 or 2, wherein the second constant current circuit comprises a resistor R6, a resistor R7, a switching tube Q2 and a comparator U2, one end of the resistor R7 is used as a first end of the second constant current circuit and is connected with a third end of the constant current control unit and one end of the resistor R3, the other end of the resistor R7 is connected with a first end of the switching tube Q2, a second end of the switching tube Q2 is used as a fourth end of the second constant current circuit and is connected with ground, a control end of the switching tube Q2 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with an output end of the comparator U2, a positive input end of the comparator U2 is used as a second end of the second constant current circuit and is used for being connected with a reference signal, and a negative input end of the comparator U2 is used as a third end of the second constant current circuit and is connected with a second end of the voltage sampling circuit.
4. The adaptive constant current load circuit according to claim 3, wherein the comparison result includes a high level signal and a low level signal; the second constant current circuit is configured to compare the sampling signal V2 with the reference signal to generate a comparison result, and control itself to be turned on and connected to the first constant current circuit according to the comparison result, and specifically includes: the comparator U2 compares the sampling signal V2 with the reference signal, when the reference signal is larger than the sampling signal V2, a high-level signal is output to control the switching tube Q1 to be turned on, and when the reference signal is smaller than the sampling signal V2, a low-level signal is output to control the switching tube Q1 to be turned off.
5. The self-adaptive constant-current load circuit according to claim 1, wherein the constant-current control unit comprises a resistor R1, a resistor R2, a switching tube Q1 and a comparator U1, the first end of the switching tube Q1 is used as the first end of the constant-current control unit and is used for being connected with the positive end of a discharging capacitor C0, the second end of the switching tube Q1 is connected with the negative input end of the comparator U1 and then is used as the third end of the constant-current control unit, the third end of the switching tube Q1 is connected with one end of a resistor R3 and the first end of the second constant-current circuit, one end of the resistor R1 is used as the second end of the constant-current control unit and is used for being connected with a control signal V1, the other end of the resistor R1 is connected with the positive input end of the comparator U1, the output end of the comparator U1 is connected with one end of the resistor R2, and one end of the resistor R2 is connected with the control end of the switching tube Q1.
6. The adaptive constant current load circuit according to claim 1, wherein the voltage sampling circuit comprises a resistor R4 and a resistor R5, one end of the resistor R4 is used as a first end of the voltage sampling circuit and is connected to a positive end of the discharge capacitor C0, the other end of the resistor R4 is connected to one end of the resistor R5 and then is used as a second end of the voltage sampling circuit and is connected to a second end of the second constant current circuit, and the other end of the resistor R5 is connected to ground.
7. The self-adaptive constant current load circuit is characterized by comprising a first constant current circuit, a voltage sampling circuit and at least one second constant current circuit;
the first constant current circuit comprises a resistor R1, a resistor R2, a resistor R3, a switching tube Q1 and a comparator U1;
the second constant current circuit comprises a resistor R6, a resistor R7, a switching tube Q2 and a comparator U2;
the voltage sampling circuit comprises a resistor R4 and a resistor R5;
the first end of the switch tube Q1 is connected with one end of the resistor R4 and then is used for being connected with the positive end of the discharge capacitor C0, the second end of the switch tube Q1 is connected with the negative input end of the comparator U1, one end of the resistor R3 and one end of the resistor R7, the control end of the comparator U1 is connected with the output end of the comparator U1 through the resistor R2, the positive input end of the comparator U1 is connected with one end of the resistor R1, the other end of the resistor R1 is used for being connected with a control signal V1, the other end of the resistor R1 is connected with the positive input end of the comparator U1, the output end of the comparator U1 is connected with one end of the resistor R2, one end of the resistor R2 is connected with the control end of the switch tube Q1, the other end of the resistor R7 is connected with the first end of the switch tube Q2, the control end of the switch tube Q2 is connected with the output end of the comparator U2 through the resistor R6, the positive input end of the comparator U2 is used for being connected with a reference signal, the negative input end of the comparator U2 is connected with the other end of the resistor R4, one end of the resistor R5 is connected with the other end of the resistor R3, the other end of the resistor R5 is connected with the second end of the switch tube Q2 is connected with the ground.
8. A power supply circuit comprising a main power circuit provided with an output capacitor and/or an input capacitor, and further comprising at least one adaptive constant current load circuit according to any one of claims 1-7, wherein a first end of the first constant current circuit, the voltage sampling circuit is connected to a positive end of the output capacitor or the input capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322262407.9U CN220775649U (en) | 2023-08-22 | 2023-08-22 | Self-adaptive constant-current load circuit and power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322262407.9U CN220775649U (en) | 2023-08-22 | 2023-08-22 | Self-adaptive constant-current load circuit and power supply circuit |
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| Publication Number | Publication Date |
|---|---|
| CN220775649U true CN220775649U (en) | 2024-04-12 |
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Family Applications (1)
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|---|---|---|---|
| CN202322262407.9U Active CN220775649U (en) | 2023-08-22 | 2023-08-22 | Self-adaptive constant-current load circuit and power supply circuit |
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| CN (1) | CN220775649U (en) |
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2023
- 2023-08-22 CN CN202322262407.9U patent/CN220775649U/en active Active
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