CN220107820U - Power supply filter circuit with temperature compensation function - Google Patents
Power supply filter circuit with temperature compensation function Download PDFInfo
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- CN220107820U CN220107820U CN202321484609.1U CN202321484609U CN220107820U CN 220107820 U CN220107820 U CN 220107820U CN 202321484609 U CN202321484609 U CN 202321484609U CN 220107820 U CN220107820 U CN 220107820U
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- temperature compensation
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- power supply
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- 230000005669 field effect Effects 0.000 claims abstract description 45
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 238000001914 filtration Methods 0.000 description 8
- 230000006978 adaptation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Abstract
The utility model discloses a power supply filter circuit with a temperature compensation function, which comprises an input port Vin, an output port Vout, a first-stage filter circuit and a second-stage filter circuit; the first-stage filter circuit comprises a field effect tube M and a triode Q1, wherein a source electrode of the field effect tube M is connected with an input port Vin, a drain electrode of the field effect tube M is grounded through a first capacitor C1, the drain electrode of the field effect tube M is also connected with the second-stage filter circuit, a first resistor R1 is connected between the source electrode and the drain electrode of the field effect tube M, and a grid electrode of the field effect tube M is grounded through a second resistor R2; the emitter of the triode Q1 is connected with the source of the field effect transistor M, and the base and the collector of the triode Q1 are both connected with the grid of the field effect transistor M; the second-stage filter circuit comprises a temperature compensation triode Q2, a temperature compensation diode D1 and a voltage stabilizing diode D2. The utility model can effectively ensure the stability of power supply of the power supply under the conditions of surge and temperature change.
Description
Technical Field
The present utility model relates to power filtering, and more particularly, to a power filtering circuit with temperature compensation.
Background
The stability of power supply of the power supply is an important index for evaluating the quality of the power supply, surge voltage may be generated at the moment of switching or when external influence is received, if the surge voltage is input to the power utilization device without any treatment, the stability of power supply is seriously affected, and damage or service life reduction of the power utilization device may be caused.
Meanwhile, the fluctuation of the temperature also affects the power supply stability of the power supply, and particularly in areas with larger day and night temperature differences, the influence caused by the sudden drop of the temperature at night is quite obvious, and a plurality of adverse effects are brought to the power supply of the power supply.
Disclosure of Invention
The utility model aims to overcome the defects of the prior art and provide a power supply filter circuit with a temperature compensation function, which can effectively ensure the stability of power supply of a power supply under the conditions of surge and temperature change.
The aim of the utility model is realized by the following technical scheme: a power supply filter circuit with a temperature compensation function comprises an input port Vin, an output port Vout, a first-stage filter circuit and a second-stage filter circuit;
the first-stage filter circuit comprises a field effect tube M and a triode Q1, wherein a source electrode of the field effect tube M is connected with an input port Vin, a drain electrode of the field effect tube M is grounded through a first capacitor C1, the drain electrode of the field effect tube M is also connected with a second-stage filter circuit, a first resistor R1 is connected between the source electrode and the drain electrode of the field effect tube M, a grid electrode of the field effect tube M is connected with one end of a second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the triode Q1 is connected with the source of the field effect transistor M, the base electrode and the collector of the triode Q1 are both connected with the grid electrode of the field effect transistor M, and the drain electrode of the field effect transistor M is also connected with the base electrode of the triode Q1;
the second-stage filter circuit comprises a temperature compensation triode Q2, a temperature compensation diode D1 and a voltage stabilizing diode D2; the collector electrode of the temperature compensation triode Q2 is connected with the drain electrode of the field effect tube M; the base electrode of the temperature compensation triode Q2 is connected with the anode of the temperature compensation diode D1, the cathode of the temperature compensation diode D1 is connected with the cathode of the zener diode D2, and the anode of the zener diode D2 is grounded; an emitter of the temperature compensation triode Q2 is connected with the output port Vout, and a third resistor R3 is further connected between a base and a collector of the temperature compensation triode Q2.
The beneficial effects of the utility model are as follows: the utility model has two stages of filter circuits, the first stage filter circuit can effectively filter surge voltage, avoid damage to devices or influence on the service life of the devices, and reduce the loss of power; the second-stage filter circuit can effectively avoid the influence of temperature fluctuation on power supply and improve the stability of power supply.
Drawings
Fig. 1 is a schematic diagram of the present utility model.
Detailed Description
The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.
As shown in fig. 1, a power supply filter circuit with a temperature compensation function includes an input port Vin, an output port Vout, a first stage filter circuit and a second stage filter circuit;
the first-stage filter circuit comprises a field effect tube M and a triode Q1, wherein a source electrode of the field effect tube M is connected with an input port Vin, the input port Vin is used for being connected with an external power supply, a drain electrode of the field effect tube M is grounded through a first capacitor C1, a drain electrode of the field effect tube M is also connected with the second-stage filter circuit, a first resistor R1 is connected between the source electrode and the drain electrode of the field effect tube M, a grid electrode of the field effect tube M is connected with one end of a second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the triode Q1 is connected with the source of the field effect transistor M, the base electrode and the collector of the triode Q1 are both connected with the grid electrode of the field effect transistor M, and the drain electrode of the field effect transistor M is also connected with the base electrode of the triode Q1;
the second-stage filter circuit comprises a temperature compensation triode Q2, a temperature compensation diode D1 and a voltage stabilizing diode D2; the collector electrode of the temperature compensation triode Q2 is connected with the drain electrode of the field effect tube M; the base electrode of the temperature compensation triode Q2 is connected with the anode of the temperature compensation diode D1, the cathode of the temperature compensation diode D1 is connected with the cathode of the zener diode D2, and the anode of the zener diode D2 is grounded; the emitter of the temperature compensation triode Q2 is connected with an output port Vout, the output port Vout is used for being connected with an electric device, and a third resistor R3 is further connected between the base electrode and the collector electrode of the temperature compensation triode Q2.
In the embodiment of the utility model, the field effect transistor M is an N-channel power MOS transistor, and the triode Q1 is a PNP transistor.
In the embodiment of the utility model, the second-stage filtering circuit further comprises an LC filtering unit, the LC filtering unit comprises a first inductor L1 and a second capacitor C2, the first end of the first inductor L1 and the first end of the second capacitor C2 are both connected with the emitter of the temperature compensation triode Q2, the second end of the first inductor L1 and the second end of the second capacitor C2 are grounded, and the filtering unit is used for filtering again before outputting, so that the power supply stability is further ensured;
in an embodiment of the present utility model, the second stage filter circuit further includes a third capacitor C3, where one end of the third capacitor C3 is connected to the base of the temperature compensation triode Q2, and the other end is grounded; the temperature compensation triode is an NPN transistor triode.
The working principle of the utility model is as follows:
after the input port Vin is connected with an external power supply, the output port Vout is connected with an electric device, and then the external power supply is turned on, in the first stage filter circuit, the triode Q1 is turned on, so that the fet M is kept turned off until the voltage across the first capacitor C1 rises enough to turn off the triode Q1, and in this period, a starting current is provided through the first resistor R1. When the voltage at two ends of the first capacitor C1 is increased to enable the voltage drop of the triode Q1 to be lower than the conducting voltage, the triode Q1 is disconnected, and the field effect transistor M is conducted to provide a low-resistance transmission channel; similarly, if a larger surge voltage is generated due to external influence in the operation process, the voltage drop of the triode Q1 is higher than the conducting voltage to be conducted again, the field effect tube is disconnected again until the voltage at the two ends of the first capacitor C1 is raised enough to turn off the triode Q1, or after the triode Q1 is turned off due to voltage recovery, the field effect tube is restored to the conducting state; the input voltage of Vin in the on state of the field effect transistor is transmitted to the second stage filter circuit through the field effect transistor M. When the external power supply is turned off to enable Vin to have no voltage input, the first-stage filter circuit is reset along with discharging of the capacitor C1. The surge voltage is actually used for charging the first capacitor C1, so that the power loss during filtering can be effectively reduced by the filter circuit; in the second stage filter circuit, the BE junction of the triode Q2 and the PN junction of the diode D1 become larger along with the temperature decrease, when the temperature decreases, the forward conducting voltage of the diode D1 increases, so that the reference voltage of the base electrode of the triode Q1 increases, but in a low temperature state, the PE junction voltage of the triode Q1 also increases, and finally the output voltage is kept unchanged, that is, the power-saving voltage directions of the diode D1 and the triode PE junction are opposite, thereby playing a role in temperature compensation.
Finally, it should be noted that the above is only a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the principle of the present utility model, and these modifications and adaptations should and are intended to be comprehended within the scope of the present utility model.
Claims (6)
1. A power supply filter circuit with temperature compensation function is characterized in that: the filter circuit comprises an input port Vin, an output port Vout, a first-stage filter circuit and a second-stage filter circuit;
the first-stage filter circuit comprises a field effect tube M and a triode Q1, wherein a source electrode of the field effect tube M is connected with an input port Vin, a drain electrode of the field effect tube M is grounded through a first capacitor C1, the drain electrode of the field effect tube M is also connected with a second-stage filter circuit, a first resistor R1 is connected between the source electrode and the drain electrode of the field effect tube M, a grid electrode of the field effect tube M is connected with one end of a second resistor R2, and the other end of the second resistor R2 is grounded; the emitter of the triode Q1 is connected with the source of the field effect transistor M, the base electrode and the collector of the triode Q1 are both connected with the grid electrode of the field effect transistor M, and the drain electrode of the field effect transistor M is also connected with the base electrode of the triode Q1;
the second-stage filter circuit comprises a temperature compensation triode Q2, a temperature compensation diode D1 and a voltage stabilizing diode D2; the collector electrode of the temperature compensation triode Q2 is connected with the drain electrode of the field effect tube M; the base electrode of the temperature compensation triode Q2 is connected with the anode of the temperature compensation diode D1, the cathode of the temperature compensation diode D1 is connected with the cathode of the zener diode D2, and the anode of the zener diode D2 is grounded; an emitter of the temperature compensation triode Q2 is connected with the output port Vout, and a third resistor R3 is further connected between a base and a collector of the temperature compensation triode Q2.
2. The power supply filter circuit with temperature compensation function according to claim 1, wherein: the field effect transistor M is an N-channel power MOS transistor.
3. The power supply filter circuit with temperature compensation function according to claim 1, wherein: the second-stage filter circuit further comprises an LC filter unit, the LC filter unit comprises a first inductor L1 and a second capacitor C2, the first end of the first inductor L1 and the first end of the second capacitor C2 are both connected with the emitter of the temperature compensation triode Q2, and the second end of the first inductor L1 and the second end of the second capacitor C2 are grounded.
4. The power supply filter circuit with temperature compensation function according to claim 1, wherein: the second-stage filter circuit further comprises a third capacitor C3, one end of the third capacitor C3 is connected to the base electrode of the temperature compensation triode Q2, and the other end of the third capacitor C3 is grounded.
5. The power supply filter circuit with temperature compensation function according to claim 1, wherein: the triode Q1 is a PNP transistor.
6. The power supply filter circuit with temperature compensation function according to claim 1, wherein: the temperature compensation triode is an NPN transistor triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321484609.1U CN220107820U (en) | 2023-06-12 | 2023-06-12 | Power supply filter circuit with temperature compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321484609.1U CN220107820U (en) | 2023-06-12 | 2023-06-12 | Power supply filter circuit with temperature compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220107820U true CN220107820U (en) | 2023-11-28 |
Family
ID=88871975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321484609.1U Active CN220107820U (en) | 2023-06-12 | 2023-06-12 | Power supply filter circuit with temperature compensation function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220107820U (en) |
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2023
- 2023-06-12 CN CN202321484609.1U patent/CN220107820U/en active Active
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