CN211744354U - Feedback load circuit and power supply aging test equipment - Google Patents
Feedback load circuit and power supply aging test equipment Download PDFInfo
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- CN211744354U CN211744354U CN202020634694.5U CN202020634694U CN211744354U CN 211744354 U CN211744354 U CN 211744354U CN 202020634694 U CN202020634694 U CN 202020634694U CN 211744354 U CN211744354 U CN 211744354U
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Abstract
The embodiment of the utility model discloses repayment load circuit and power aging testing equipment is disclosed. The first end of a primary coil of a transformer of the circuit is electrically connected with the positive electrode of the direct-current power supply, and the second end of the primary coil of the transformer is electrically connected with the first end of the switch sub-circuit and the positive electrode of the first diode; the first end of the secondary coil of the transformer is electrically connected with the input end of the first capacitor, and the second end of the secondary coil of the transformer is electrically connected with the anode of the second diode; the cathode of the first diode is electrically connected with the input end of the first capacitor; the negative electrode of the second diode is electrically connected with the input end of the second capacitor and the positive end of the load; the negative electrode of the direct current power supply is electrically connected with the second end of the switch sub-circuit, the output end of the first capacitor, the output end of the second capacitor and the negative end of the load; the control module is electrically connected with the signal end of the switch sub-circuit. The utility model is suitable for an application scene that the input voltage scope is wide, switch sub-circuit's duty cycle is low, has improved the accuracy of repayment load circuit work.
Description
Technical Field
The utility model relates to a repayment load circuit technical field especially relates to a repayment load circuit and power aging testing equipment.
Background
Aiming at feedback aging of different batteries, adapter power supplies and LED power supplies, a feedback load circuit with a wide input voltage range is needed, the input voltage range of the feedback load circuit is 3V to 100V, and the output voltage is 100V. In the prior art, feedback load is realized by matching a BOOST circuit and a flyback circuit, the voltage transmission ratio of the BOOST circuit is K1 ═ 1/(1-D), D is the duty ratio of a switching circuit, the voltage transmission ratio of the flyback circuit is K2 ═ Ns × D/(Np (1-D)), and the voltage transmission ratio of the flyback circuit and the BOOST circuit is K3 ═ 1+ Ns × D/Np)/(1-D. Under the condition that a power device is an ideal device and no voltage drop exists on a line, when the lowest input voltage is 3V, the feedback load circuit BOOSTs the 3V input voltage to 100V for output, and a switch sub-circuit of the BOOST circuit can be realized only by the duty ratio of 0.97; when the line voltage drop and the power device voltage drop are calculated in an actual circuit, the duty ratio of the switch sub-circuit needs to be further improved to be close to 1, and then the 3V input voltage can be boosted to 100V for output. Because the circuit modulation is complex, it is difficult to increase the duty ratio of the switch sub-circuit to be close to 1, thereby affecting the working accuracy of the feedback load circuit. Therefore, it is important to provide a feedback load circuit with high boosting and low duty ratio of the switch sub-circuit.
Disclosure of Invention
Therefore, it is necessary to provide a feedback load circuit and a power supply aging test device for solving the technical problem that it is difficult to increase the duty ratio of the switch sub-circuit of the feedback load circuit to be close to 1 in the prior art, so that the accuracy of the operation of the feedback load circuit is affected.
In a first aspect, the utility model provides a repayment load circuit is applied to power aging testing equipment, repayment load circuit includes: the circuit comprises a transformer, a first diode, a second diode, a first capacitor, a second capacitor, a switch sub-circuit, a load positive terminal, a load negative terminal and a control module;
the first end of the primary coil of the transformer is electrically connected with the positive electrode of the direct-current power supply, and the second end of the primary coil of the transformer is electrically connected with the first end of the switch sub-circuit and the positive electrode of the first diode;
a first end of a secondary coil of the transformer is electrically connected with the input end of the first capacitor, and a second end of the secondary coil of the transformer is electrically connected with the anode of the second diode;
the cathode of the first diode is electrically connected with the input end of the first capacitor;
the negative electrode of the second diode is electrically connected with the input end of the second capacitor and the positive electrode end of the load;
the negative electrode of the direct current power supply is electrically connected with the second end of the switch sub-circuit, the output end of the first capacitor, the output end of the second capacitor and the negative electrode end of the load;
the control module is electrically connected with a signal end of the switch sub-circuit and used for sending a driving signal to the switch sub-circuit, and the driving signal comprises a high level signal and a low level signal.
In one embodiment, the switch sub-circuit comprises an N-channel enhancement type MOS tube;
the G pole of the N-channel enhanced MOS tube is electrically connected with the control module, the D pole of the N-channel enhanced MOS tube is electrically connected with the primary coil of the transformer, and the S pole of the N-channel enhanced MOS tube is electrically connected with the negative pole of the direct-current power supply.
In one embodiment, the specification of the N-channel enhancement type MOS transistor includes 200V, 60A.
In one embodiment, the feedback load circuit further comprises: at least one third capacitor;
the first end of the third capacitor is electrically connected with the positive pole of the direct current power supply, and the second end of the third capacitor is electrically connected with the negative pole of the direct current power supply.
In one embodiment, the feedback load circuit further comprises: a fourth capacitor, a fifth capacitor, an inductor;
a first end of the fourth capacitor is electrically connected with the positive electrode of the direct current power supply, and a second end of the fourth capacitor is electrically connected with the negative electrode of the direct current power supply;
a first end of the inductor is electrically connected with a positive electrode of the direct current power supply, and a second end of the inductor is electrically connected with an input end of the fifth capacitor;
the primary coil of the transformer is electrically connected with the inductor;
and the negative electrode of the direct current power supply is electrically connected with the output end of the fourth capacitor and the output end of the fifth capacitor.
In one embodiment, the feedback load circuit further comprises: an isolation drive sub-circuit;
the input end of the isolation driving sub-circuit is electrically connected with the control module, and the output end of the isolation driving sub-circuit is electrically connected with the signal end of the switch sub-circuit.
In one embodiment, the feedback load circuit further comprises: a filter sub-circuit for stabilizing a voltage;
the positive input end of the filter sub-circuit is electrically connected with the negative electrode of the second diode, and the negative input end of the filter sub-circuit is electrically connected with the negative electrode of the direct-current power supply;
and the positive output end of the filter sub-circuit is electrically connected with the positive end of the load, and the negative output end of the filter sub-circuit is electrically connected with the negative end of the load.
In one embodiment, the feedback load circuit further comprises: a power conversion sub-circuit for converting a direct current into an alternating current;
the positive input end of the power supply conversion sub-circuit is electrically connected with the positive output end of the filter sub-circuit, and the negative input end of the power supply conversion sub-circuit is electrically connected with the negative output end of the filter sub-circuit;
and the output end of the power supply conversion sub-circuit is electrically connected with an alternating current power grid.
In one embodiment, the transformer specification includes: the transformation ratio is 5:20, the PQ3535 magnetic core and the primary side inductance are 50 uH;
the specification of the first diode includes: 200V, 60A;
the specification of the second diode includes: 200V, 60A;
the specification of the first capacitor comprises: 250V, 10 uF;
the specification of the second capacitor comprises: 160V, 470 uF.
In a second aspect, the utility model also provides a power supply aging testing equipment, include: the feedback load circuit of any of the first aspect.
To sum up, the feedback load circuit of the present invention forms a boost circuit by the inductance of the switch sub-circuit, the first diode, the first capacitor, and the transformer, thereby realizing the high boost of the input voltage, and being suitable for the application scenario with wide input voltage range; the flyback circuit is formed by the switch sub-circuit, the transformer, the second diode and the second capacitor, so that feedback on a load is realized; when the input voltage is 3V and 100V voltage needs to be output, the duty ratio of the switch sub-circuit of the whole circuit is close to 0.54, compared with the prior art which is close to 1, the circuit modulation is simpler, and the working accuracy of the feedback load circuit is improved. Therefore, the utility model is suitable for an application scene that the input voltage scope is wide has realized the high repayment of stepping up and load, and switch sub-circuit's duty cycle is low, has improved the accuracy of repayment load circuit work.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Wherein:
FIG. 1 is a schematic circuit diagram of a feedback load circuit in one embodiment;
FIG. 2 is a circuit block diagram of the feedback load circuit of FIG. 1;
FIG. 3 is a schematic circuit diagram of another embodiment of a feedback load circuit;
fig. 4 is a circuit block diagram of the feedback load circuit of fig. 3.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1 to 4, in one embodiment, a feedback load circuit applied to a power supply burn-in test apparatus is provided, the feedback load circuit includes: the circuit comprises a transformer T1, a first diode D1, a second diode D2, a first capacitor C3, a second capacitor C4, a switch sub-circuit Q1, a load positive terminal, a load negative terminal and a control module 60;
a first end of the primary coil of the transformer T1 is electrically connected to a positive electrode of a dc power supply, and a second end of the primary coil of the transformer T1 is electrically connected to a first end of the switch sub-circuit Q1 and a positive electrode of the first diode D1;
a first end of a secondary coil of the transformer T1 is electrically connected with an input end of the first capacitor C3, and a second end of the secondary coil of the transformer T1 is electrically connected with a positive electrode of the second diode D2;
the cathode of the first diode D1 is electrically connected with the input end of the first capacitor C3;
the negative electrode of the second diode D2 is electrically connected with the input end of the second capacitor C4 and the positive load terminal;
the negative electrode of the direct current power supply is electrically connected with the second end of the switch sub-circuit Q1, the output end of the first capacitor C3, the output end of the second capacitor C4 and the negative electrode end of the load;
the control module 60 is electrically connected to a signal terminal of the switch sub-circuit Q1, and is configured to send a driving signal to the switch sub-circuit Q1, where the driving signal includes a high level signal and a low level signal.
The feedback load circuit of the embodiment forms a booster circuit by the inductance of the switch sub-circuit Q1, the first diode D1, the first capacitor C3 and the transformer T1, realizes high boosting of the input voltage, and is suitable for application scenarios with wide input voltage range; a flyback circuit is formed by the switch sub-circuit Q1, the transformer T1, the second diode D2 and the second capacitor C4, so that feedback of a load is realized; when the input voltage is 3V and 100V voltage needs to be output, the duty ratio of the switch sub-circuit Q1 of the whole circuit is close to 0.54, compared with the prior art which is close to 1, the circuit modulation is simpler, and the working accuracy of the feedback load circuit is improved.
The high boost working principle of the feedback load circuit is as follows: when the switch sub-circuit Q1 is turned on, the primary coil of the transformer T1 is charged as an inductor, the first capacitor C3 is discharged, and when the switch sub-circuit Q1 is turned off, the inductor current of the primary coil of the transformer T1 is discharged through the first diode D1, so that the first capacitor C3 is charged, a freewheeling function is realized, and a function of increasing the input voltage is realized.
The flyback working principle of the feedback load circuit is as follows: when the switch sub-circuit Q1 is turned on, the second diode D2 electrically connected to the secondary winding of the transformer T1 is turned off, the second capacitor C4 discharges the load connected to the load positive terminal and the load negative terminal, and when the switch sub-circuit Q1 is turned off, the second diode D2 electrically connected to the secondary winding of the transformer T1 is turned on to charge the second capacitor C4, thereby realizing a freewheeling function and realizing a feedback load.
The control module 60 may select an MCU (micro control unit) and/or a PLC (Programmable Logic Controller) and/or an FPGA (field Programmable Gate Array) from the prior art, which is not limited in this embodiment.
The transformer T1 may be a power transformer T1 selected from the prior art, and is not limited in this respect.
The first diode D1 may be a power diode selected from the prior art, and is not limited in this example.
The second diode D2 may be a power diode selected from the prior art, and is not limited in this example.
The first capacitor C3 and the second capacitor C4 may be capacitors selected from the prior art, and are not limited in this embodiment.
The load positive terminal is the positive electrode of the load; the load negative electrode end refers to a negative electrode of a load.
The switch sub-circuit Q1 is turned on when the driving signal is a high level signal, and the switch sub-circuit Q1 is turned off when the driving signal is a low level signal.
In one embodiment, the negative terminal of the dc power supply, the second terminal of the switch sub-circuit Q1, the output terminal of the first capacitor C3, the output terminal of the second capacitor C4, and the negative terminal of the load are grounded.
In one embodiment, the switch sub-circuit Q1 comprises an N-channel enhancement type MOS transistor;
the G pole of the N-channel enhanced MOS tube is electrically connected with the control module 60, the D pole of the N-channel enhanced MOS tube is electrically connected with the primary coil of the transformer T1, and the S pole of the N-channel enhanced MOS tube is electrically connected with the negative pole of the direct-current power supply. The N-channel enhancement type MOS tube realizes the control of the discharge and the follow current of the first capacitor C3 and the second capacitor C4.
In one embodiment, the specification of the N-channel enhancement type MOS transistor includes 200V, 60A. Relative prior art adopts BOOST circuit and flyback circuit cooperation to realize the condition of repayment load, the technical scheme of the utility model the voltage stress of voltage stress ratio flyback circuit is little.
As shown in fig. 1 and 2, in one embodiment, the feedback load circuit further includes: a fourth capacitance C1, a fifth capacitance C2, an inductor L1;
a first end of the fourth capacitor C1 is electrically connected with the positive pole of the direct current power supply, and a second end of the fourth capacitor C1 is electrically connected with the negative pole of the direct current power supply;
a first end of the inductor L1 is electrically connected to the positive electrode of the dc power supply, and a second end of the inductor L1 is electrically connected to the input end of the fifth capacitor C2;
the primary coil of the transformer T1 is electrically connected with the inductor L1;
and the negative electrode of the direct current power supply is electrically connected with the output end of the fourth capacitor C1 and the output end of the fifth capacitor C2. The current input by the direct current power supply is filtered through the cooperation of the fourth capacitor C1, the fifth capacitor C2 and the inductor L1.
The fourth capacitor C1 and the fifth capacitor C2 may be capacitors selected from the prior art, and are not limited in this example.
The inductor L1 has a certain inductance for blocking the change of current, and the inductor L1 with corresponding specification can be selected from the prior art, which is not described herein.
As shown in fig. 3 and 4, in another embodiment, the feedback load circuit further includes: at least one third capacitance C5;
a first end of the third capacitor C5 is electrically connected to a positive electrode of the dc power supply, and a second end of the third capacitor C5 is electrically connected to a negative electrode of the dc power supply. The current of the direct current power supply input is filtered by arranging at least one third capacitor C5.
The third capacitor C5 may be selected from the prior art, and is not limited in this embodiment.
In one embodiment, the feedback load circuit further comprises: an isolation drive sub-circuit 50;
the input end of the isolation driving sub-circuit 50 is electrically connected to the control module 60, and the output end of the isolation driving sub-circuit 50 is electrically connected to the signal end of the switch sub-circuit Q1. The isolation between the control module 60 and the feedback load circuit is realized through the isolation driving sub-circuit 50, so that the insulation is realized, and the safety of the feedback load circuit is improved.
The isolation driving sub-circuit 50 may be an integrated circuit capable of implementing isolation driving, which is not described herein.
In one embodiment, the feedback load circuit further comprises: a filter sub-circuit 20 for stabilizing the voltage;
the positive input end of the filter sub-circuit 20 is electrically connected with the negative electrode of the second diode D2, and the negative input end of the filter sub-circuit 20 is electrically connected with the negative electrode of the dc power supply;
the positive output end of the filter sub-circuit 20 is electrically connected with the positive end of the load, and the negative output end of the filter sub-circuit 20 is electrically connected with the negative end of the load. By arranging the filter sub-circuit 20, the voltage output to the load through the load positive terminal and the load negative terminal is stabilized at the preset output voltage (for example, the preset output voltage is 100V), so that the stability of the output voltage of the feedback load circuit is improved.
The filtering sub-circuit 20 may select an integrated circuit or a filter with a corresponding specification from the prior art, which is not described herein.
In one embodiment, the feedback load circuit further comprises: a power conversion sub-circuit 30 for converting a direct current into an alternating current;
the positive input end of the power conversion sub-circuit 30 is electrically connected with the positive output end of the filter sub-circuit 20, and the negative input end of the power conversion sub-circuit 30 is electrically connected with the negative output end of the filter sub-circuit 20;
the output of the power conversion sub-circuit 30 is electrically connected to an ac power grid 40. The power conversion sub-circuit 30 converts the direct current into alternating current, and transmits the obtained alternating current to the alternating current power grid 40, so that the electric energy is recycled, and the energy consumption is reduced.
The power conversion sub-circuit 30 may be an integrated circuit or an inverter that converts dc current into ac current, which is not described herein.
In one embodiment, the specification of the transformer T1 includes: the transformation ratio is 5:20, the PQ3535 magnetic core and the primary side inductance is 50uH (microHenry);
the specification of the first diode D1 includes: 200V, 60A;
the specification of the second diode D2 includes: 200V, 60A;
the specification of the first capacitor C3 includes: 250V, 10uF (microfarads);
the specification of the second capacitor C4 includes: 160V, 470 uF.
In one embodiment, the specification of the fourth capacitor C1 includes 160V, 470 uF; the specification of the fifth capacitor C2 comprises 160V and 470 uF; the specification of the inductor L1 includes 20uH, 20A.
In one embodiment, the floating range of the size of the transformer T1, the size of the first diode D1, the size of the second diode D2, the size of the first capacitor C3, the size of the second capacitor C4, the size of the fourth capacitor C1, the size of the fifth capacitor C2, and the size of the inductor L1 is greater than or equal to-10%, and less than or equal to 10%.
In one embodiment, the utility model also provides a power supply aging testing equipment, include: the feedback load circuit of any of the above.
The power supply aging test equipment is used for carrying out aging test on a power supply loading load. For example, the aging test is performed on the battery, the adapter power supply, and the LED power loading load, which is not limited in this embodiment.
The feedback load circuit of the embodiment forms a booster circuit by the inductance of the switch sub-circuit Q1, the first diode D1, the first capacitor C3 and the transformer T1, realizes high boosting of the input voltage, and is suitable for application scenarios with wide input voltage range; a flyback circuit is formed by the switch sub-circuit Q1, the transformer T1, the second diode D2 and the second capacitor C4, so that feedback of a load is realized; when the input voltage is 3V and 100V voltage needs to be output, the duty ratio of the switch sub-circuit Q1 of the whole circuit is close to 0.54, compared with the prior art which is close to 1, the circuit modulation is simpler, and the working accuracy of the feedback load circuit is improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. A feedback load circuit applied to power supply aging test equipment is characterized by comprising: the circuit comprises a transformer, a first diode, a second diode, a first capacitor, a second capacitor, a switch sub-circuit, a load positive terminal, a load negative terminal and a control module;
the first end of the primary coil of the transformer is electrically connected with the positive electrode of the direct-current power supply, and the second end of the primary coil of the transformer is electrically connected with the first end of the switch sub-circuit and the positive electrode of the first diode;
a first end of a secondary coil of the transformer is electrically connected with the input end of the first capacitor, and a second end of the secondary coil of the transformer is electrically connected with the anode of the second diode;
the cathode of the first diode is electrically connected with the input end of the first capacitor;
the negative electrode of the second diode is electrically connected with the input end of the second capacitor and the positive electrode end of the load;
the negative electrode of the direct current power supply is electrically connected with the second end of the switch sub-circuit, the output end of the first capacitor, the output end of the second capacitor and the negative electrode end of the load;
the control module is electrically connected with a signal end of the switch sub-circuit and used for sending a driving signal to the switch sub-circuit, and the driving signal comprises a high level signal and a low level signal.
2. The feedback load circuit of claim 1 wherein the switch sub-circuit comprises an N-channel enhancement MOS transistor;
the G pole of the N-channel enhanced MOS tube is electrically connected with the control module, the D pole of the N-channel enhanced MOS tube is electrically connected with the primary coil of the transformer, and the S pole of the N-channel enhanced MOS tube is electrically connected with the negative pole of the direct-current power supply.
3. The feedback load circuit of claim 2 wherein the N-channel enhancement mode MOS transistor has a specification comprising 200V, 60A.
4. The feedback load circuit of claim 1, further comprising: at least one third capacitor;
the first end of the third capacitor is electrically connected with the positive pole of the direct current power supply, and the second end of the third capacitor is electrically connected with the negative pole of the direct current power supply.
5. The feedback load circuit of claim 1, further comprising: a fourth capacitor, a fifth capacitor, an inductor;
a first end of the fourth capacitor is electrically connected with the positive electrode of the direct current power supply, and a second end of the fourth capacitor is electrically connected with the negative electrode of the direct current power supply;
a first end of the inductor is electrically connected with a positive electrode of the direct current power supply, and a second end of the inductor is electrically connected with an input end of the fifth capacitor;
the primary coil of the transformer is electrically connected with the inductor;
and the negative electrode of the direct current power supply is electrically connected with the output end of the fourth capacitor and the output end of the fifth capacitor.
6. The feedback load circuit of any of claims 1-5, further comprising: an isolation drive sub-circuit;
the input end of the isolation driving sub-circuit is electrically connected with the control module, and the output end of the isolation driving sub-circuit is electrically connected with the signal end of the switch sub-circuit.
7. The feedback load circuit of any of claims 1-5, further comprising: a filter sub-circuit for stabilizing a voltage;
the positive input end of the filter sub-circuit is electrically connected with the negative electrode of the second diode, and the negative input end of the filter sub-circuit is electrically connected with the negative electrode of the direct-current power supply;
and the positive output end of the filter sub-circuit is electrically connected with the positive end of the load, and the negative output end of the filter sub-circuit is electrically connected with the negative end of the load.
8. The feedback load circuit of claim 7, further comprising: a power conversion sub-circuit for converting a direct current into an alternating current;
the positive input end of the power supply conversion sub-circuit is electrically connected with the positive output end of the filter sub-circuit, and the negative input end of the power supply conversion sub-circuit is electrically connected with the negative output end of the filter sub-circuit;
and the output end of the power supply conversion sub-circuit is electrically connected with an alternating current power grid.
9. The feedback load circuit of any of claims 1-5, wherein the transformer has specifications comprising: the transformation ratio is 5:20, the PQ3535 magnetic core and the primary side inductance are 50 uH;
the specification of the first diode includes: 200V, 60A;
the specification of the second diode includes: 200V, 60A;
the specification of the first capacitor comprises: 250V, 10 uF;
the specification of the second capacitor comprises: 160V, 470 uF.
10. A power supply burn-in apparatus, comprising: the feedback load circuit of any of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020634694.5U CN211744354U (en) | 2020-04-24 | 2020-04-24 | Feedback load circuit and power supply aging test equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020634694.5U CN211744354U (en) | 2020-04-24 | 2020-04-24 | Feedback load circuit and power supply aging test equipment |
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| CN211744354U true CN211744354U (en) | 2020-10-23 |
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| CN202020634694.5U Active CN211744354U (en) | 2020-04-24 | 2020-04-24 | Feedback load circuit and power supply aging test equipment |
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