CN220254350U - Far-end voltage drop compensation circuit of direct-current power supply - Google Patents
Far-end voltage drop compensation circuit of direct-current power supply Download PDFInfo
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- CN220254350U CN220254350U CN202321445762.3U CN202321445762U CN220254350U CN 220254350 U CN220254350 U CN 220254350U CN 202321445762 U CN202321445762 U CN 202321445762U CN 220254350 U CN220254350 U CN 220254350U
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Abstract
The utility model discloses a far-end voltage drop compensation circuit of a direct-current power supply, which comprises a first pull-up resistor, a second pull-up resistor, a first voltage stabilizing tube, a second voltage stabilizing tube, a freewheel diode, a first thermistor, a second thermistor, a first equivalent internal resistance and a second equivalent internal resistance, wherein the first voltage stabilizing tube is connected with the first voltage stabilizing tube; the voltage drop compensation circuit is divided into 2 circuits, wherein one circuit is a positive voltage input/output circuit, and the other circuit is a negative voltage input/output circuit; the positive voltage input/output circuit consists of a first pull-up resistor, a first voltage stabilizing tube, a first thermistor and a first equivalent internal resistance, and the negative voltage input/output circuit consists of a second pull-up resistor, a second voltage stabilizing tube, a second thermistor and a second equivalent internal resistance.
Description
Technical Field
The utility model relates to the technical field of voltage drop compensation, in particular to a far-end voltage drop compensation circuit of a direct-current power supply.
Background
When the direct current power supply supplies power to a load, a certain voltage drop is generated on the line due to the existence of the internal resistance of the line, so that the voltage of a load end is lower than the voltage of an output end of the direct current power supply, the requirement of the load cannot be met, and the direct current power supply needs to have a voltage drop compensation function;
to achieve pressure drop compensation, the patent numbers are: CN202220769461.5, entitled: a voltage drop compensation circuit, a voltage drop compensation device and an utility model patent of an electronic device are disclosed, the voltage drop compensation circuit of the patent comprises: the first voltage conversion circuit comprises a first control sub-circuit, a first switch sub-circuit and a first energy storage sub-circuit, wherein the first switch sub-circuit receives a first control signal sent by the first control sub-circuit so as to change the on-off state of the first control signal, so that a first power supply charges and discharges the first energy storage sub-circuit, and correspondingly outputs a second power supply to a load through the first energy storage sub-circuit; and the first voltage feedback circuit feeds back a second power supply correspondingly output by the first energy storage sub-circuit to the first control sub-circuit, so that the first control sub-circuit correspondingly adjusts the first control signal, and further adjusts the charge and discharge states of the first power supply to the first energy storage sub-circuit so as to adjust the second power supply. Through the mode, the voltage drop compensation circuit can effectively reduce potential safety hazards of load power supply, reduces extra power loss, and is lower in implementation cost.
However, the voltage drop compensation of the mainstream dc power supply in the market still has a certain disadvantage:
(1) The remote detection line is easy to burn out the power supply when being reversely connected;
(2) When the remote detection line loosens and falls off, the power supply output is abnormal;
(3) The remote pressure drop detection is carried out through the collection operation of an active device, and the structure is complex and the cost is high;
the prior art can not meet the demands of people at present, and based on the present situation, the prior art needs to be improved.
Disclosure of Invention
The present utility model is directed to a dc power supply remote voltage drop compensation circuit, so as to solve the above-mentioned problems in the prior art.
The utility model provides a far-end voltage drop compensation circuit of a direct-current power supply, which comprises a first pull-up resistor, a second pull-up resistor, a first voltage stabilizing tube, a second voltage stabilizing tube, a follow current diode, a first thermistor, a second thermistor, a first equivalent internal resistance and a second equivalent internal resistance, wherein the first voltage stabilizing tube is connected with the first voltage stabilizing tube;
the voltage drop compensation circuit is divided into 2 circuits, wherein one circuit is a positive voltage input/output circuit, and the other circuit is a negative voltage input/output circuit; wherein,
the forward voltage input/output circuit consists of a first pull-up resistor, a first voltage stabilizing tube, a first thermistor and a first equivalent internal resistance, and is divided into a forward voltage input circuit and a forward voltage output circuit; wherein,
the forward voltage input circuit is formed by coupling a power supply end to a load through a first equivalent internal resistance connected in series;
the forward voltage output circuit is formed by connecting a first thermistor in series with a first voltage stabilizing tube and then connecting a first pull-up resistor in parallel; one end of the first pull-up resistor is coupled to the power supply voltage, and the other end of the first pull-up resistor is coupled to a differential operational amplifier in the direct current power supply as a forward sampling voltage;
the negative voltage input/output circuit consists of a second pull-up resistor, a second voltage stabilizing tube, a second thermistor and a second equivalent internal resistance, and is divided into a negative voltage input circuit and a negative voltage output circuit; wherein,
the negative voltage input circuit is formed by coupling a power supply end to a load through a second equivalent internal resistance connected in series;
the negative voltage output circuit is formed by connecting a second thermistor in series with a second voltage stabilizing tube and then connecting a second pull-up resistor in parallel; one end of the second pull-up resistor is coupled to the power supply voltage, and the other end of the second pull-up resistor is coupled to a differential operational amplifier in the direct current power supply as negative sampling voltage;
the positive voltage input circuit and the negative voltage input circuit are coupled through a freewheeling diode, wherein one end of the freewheeling diode is connected with a first voltage stabilizing tube in series, and the other end of the freewheeling diode is connected with a second voltage stabilizing tube in series;
the positive voltage input circuit and the negative voltage input circuit are symmetrical circuits, and the positive voltage is consistent with the negative voltage input and output.
The utility model has the following beneficial effects:
according to the utility model, the load voltage is detected to be low, compensation is carried out to the original set value of the output voltage of the direct-current power supply, meanwhile, the maximum value of the voltage which can be compensated is limited through the first voltage stabilizing tube ZI and the second voltage stabilizing tube Z2, and the maximum compensation voltage is 2 times the voltage stabilizing value of the voltage stabilizing tube;
when the remote detection line is connected reversely or falls off, the first thermistor PTC1 and the second thermistor PTC2 can instantaneously heat, the resistance value is increased, the rapid blocking structure is simple, and the problem that the power supply is burnt out or the output is abnormal due to the fact that the remote detection line is connected reversely or falls off is solved;
drawings
Fig. 1 is a schematic circuit structure of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments obtained by those skilled in the art based on the present utility model without making any inventive effort fall within the scope of the present utility model.
The utility model provides a far-end voltage drop compensation circuit of a direct-current power supply, which comprises a first pull-up resistor, a second pull-up resistor, a first voltage stabilizing tube, a second voltage stabilizing tube, a follow current diode, a first thermistor, a second thermistor, a first equivalent internal resistance and a second equivalent internal resistance, wherein the first voltage stabilizing tube is connected with the first voltage stabilizing tube;
the voltage drop compensation circuit is divided into 2 circuits, wherein one circuit is a positive voltage input/output circuit, and the other circuit is a negative voltage input/output circuit; wherein,
the forward voltage input/output circuit consists of a first pull-up resistor, a first voltage stabilizing tube, a first thermistor and a first equivalent internal resistance, and is divided into a forward voltage input circuit and a forward voltage output circuit; wherein,
the forward voltage input circuit is formed by coupling a power supply end to a load through a first equivalent internal resistance connected in series;
the forward voltage output circuit is formed by connecting a first thermistor in series with a first voltage stabilizing tube and then connecting a first pull-up resistor in parallel; one end of the first pull-up resistor is coupled to the power supply voltage, and the other end of the first pull-up resistor is coupled to a differential operational amplifier in the direct current power supply as a forward sampling voltage;
the negative voltage input/output circuit consists of a second pull-up resistor, a second voltage stabilizing tube, a second thermistor and a second equivalent internal resistance, and is divided into a negative voltage input circuit and a negative voltage output circuit; wherein,
the negative voltage input circuit is formed by coupling a power supply end to a load through a second equivalent internal resistance connected in series;
the negative voltage output circuit is formed by connecting a second thermistor in series with a second voltage stabilizing tube and then connecting a second pull-up resistor in parallel; one end of the second pull-up resistor is coupled to the power supply voltage, and the other end of the second pull-up resistor is coupled to a differential operational amplifier in the direct current power supply as negative sampling voltage;
the positive voltage input circuit and the negative voltage input circuit are coupled through a freewheeling diode, wherein one end of the freewheeling diode is connected with a first voltage stabilizing tube in series, and the other end of the freewheeling diode is connected with a second voltage stabilizing tube in series;
the positive voltage input circuit and the negative voltage input circuit are symmetrical circuits, and the positive voltage is consistent with the negative voltage input and output;
the first pull-up resistor and the second pull-up resistor are adjustable voltage drop detection resistors, and the resistance values of the resistors can be tens of omega to hundreds of omega according to different values of output voltages;
the voltage stabilizing values of the first voltage stabilizing tube and the second voltage stabilizing tube can be adjusted according to the maximum voltage value to be compensated, for example, a voltage value within 5V is generally selected as the maximum voltage value adjusting value; the first voltage stabilizing tube and the second voltage stabilizing tube comprise, but are not limited to, voltage stabilizing diodes, and can be TVS (transient suppression diode) or common diodes connected in series or other voltage stabilizing devices;
when voltage is acquired, the situation that the far-end sampling line is reversely connected exists, and the free-wheeling diode works under the situation that the far-end sampling line is reversely connected and is used for protecting a circuit; the first thermistor and the second thermistor play a role in protection under the condition that the remote sampling lines are reversely connected;
referring to fig. 1, the present utility model provides an alternative embodiment, which applies the present utility model to a dc power supply, and details the working principle of the present utility model, in the embodiment, vo+ is a positive supply voltage output by the dc power supply, and VO-is a negative supply voltage output by the dc power supply, which are connected to a positive terminal and a negative terminal of a load, respectively; vsense+ and Vsense-are the remote positive and negative voltage sampling points of the dc power supply, respectively, and are also connected to the positive and negative terminals of the load, respectively; VS+ and VS-are respectively positive and negative voltages which are sent to a differential operational amplifier in the DC power supply after the remote voltage of the DC power supply is sampled; when the voltage drop of the line is caused by the first equivalent internal resistance RW1 and the second equivalent internal resistance RW2 in the line, the voltage of the load end is lower than the voltage VO of the output end of the direct-current power supply, and at the moment, the circuit can judge the voltage drop condition of the load end indirectly by detecting the VS+ and VS-voltage, so that the power supply of the output end of the direct-current power supply is regulated, and the voltage of the load end is always maintained at a set voltage value;
in the embodiment, when the remote compensation function is started, vs+ sends the divided voltages of the vo+ and the vsense+ to the non-inverting input end of the differential operational amplifier in the direct-current power supply, and because the internal resistance of the first thermistor PTC1 self-recovery fuse is small and can be ignored, vs+ =vsense+; VS- =vsense-; this achieves sampling of the far-end voltage. When a load has large current, the voltage drop of the circuit is generated due to the equivalent internal resistances RW1 and RW2, so that the voltage of the load end is lower than the voltage VO of the output end of the direct current power supply, the sampling circuit detects that the load voltage is lower and compensation is carried out to the original set value of the output voltage of the direct current power supply, meanwhile, the maximum value of the compensation voltage is limited due to the existence of the first voltage stabilizing tube ZI and the second voltage stabilizing tube Z2, and the maximum compensation voltage is 2 times of the voltage stabilizing value of the voltage stabilizing tube;
in this embodiment, when vsense+/Vsense-is reversed, the current flow direction of the voltage sampling line is P1 terminal-Vsense-terminal-PTC 2-D1-PTC 1-P2 terminal, at this time, the first thermistor PTC1 and the second thermistor PTC2 will instantaneously generate heat, the resistance value becomes large and rapidly block, and the voltage of the far-end sampling voltage vs+/VS-becomes vo+/VO-, and will not be suspended;
in this embodiment, when the Vsense+/Vsense-detection line loosens and falls off, the voltage of the sampling voltage VS+/VS at the far end becomes VO+/VO-, and is not suspended.
In an embodiment, when the remote compensation function is not enabled, the vsense+/Vsense-to-load detection line is not connected in a blank mode, and because the input impedance of the differential sampling circuit in the direct current power supply is M omega level, and the voltage drop detection resistor with adjustable remote ends is used for: the resistance values of the first pull-up resistor R1 and the second pull-up resistor R2 are several tens of Ω, so that the first pull-up resistor R1 and the second pull-up resistor R2 can be ignored when the remote compensation function is not activated.
Although the present utility model has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present utility model.
Claims (10)
1. A dc power supply remote voltage drop compensation circuit, comprising: the first resistor, the second resistor, the first voltage stabilizing tube, the second voltage stabilizing tube, the follow current diode, the first thermistor, the second thermistor, the first equivalent internal resistance and the second equivalent internal resistance;
the voltage drop compensation circuit is divided into 2 circuits, wherein one circuit is a positive voltage input/output circuit, and the other circuit is a negative voltage input/output circuit; wherein,
the forward voltage input/output circuit consists of a first pull-up resistor, a first voltage stabilizing tube, a first thermistor and a first equivalent internal resistance, and is divided into a forward voltage input circuit and a forward voltage output circuit; wherein,
the forward voltage input circuit is formed by coupling a power supply end to a load through a first equivalent internal resistance connected in series;
the forward voltage output circuit is formed by connecting a first thermistor in series with a first voltage stabilizing tube and then connecting a first pull-up resistor in parallel; one end of the first pull-up resistor is coupled with the voltage of the power supply end, and the other end of the first pull-up resistor is coupled with a differential operational amplifier in the direct current power supply as a forward sampling voltage;
the negative voltage input/output circuit consists of a second pull-up resistor, a second voltage stabilizing tube, a second thermistor and a second equivalent internal resistance, and is divided into a negative voltage input circuit and a negative voltage output circuit; wherein,
the negative voltage input circuit is formed by coupling a power supply end to a load through a second equivalent internal resistance connected in series;
the negative voltage output circuit is formed by connecting a second thermistor in series with a second voltage stabilizing tube and then connecting a second pull-up resistor in parallel; one end of the second pull-up resistor is coupled to the power supply voltage, and the other end of the second pull-up resistor is coupled to a differential operational amplifier inside the direct current power supply as a negative sampling voltage.
2. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the positive voltage input circuit and the negative voltage input circuit are coupled through a freewheeling diode, wherein one end of the freewheeling diode is connected with a first voltage stabilizing tube in series, and the other end of the freewheeling diode is connected with a second voltage stabilizing tube in series.
3. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the positive voltage input circuit and the negative voltage input circuit are symmetrical circuits, and the positive voltage is consistent with the negative voltage input and output.
4. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the first pull-up resistor and the second pull-up resistor are adjustable voltage drop detection resistors, and the resistance values of the resistors can be tens of omega to hundreds of omega according to different values of output voltage.
5. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the first voltage stabilizing tube and the second voltage stabilizing tube are formed by connecting voltage stabilizing diodes or TVS or common diodes in series.
6. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the voltage stabilizing values of the first voltage stabilizing tube and the second voltage stabilizing tube are adjusted according to the maximum voltage value required to be compensated, and the maximum compensation voltage is 2 times of the voltage stabilizing value of the first voltage stabilizing tube or the second voltage stabilizing tube.
7. The dc power supply remote voltage drop compensation circuit of claim 6, wherein: the maximum compensation voltage is less than 5V.
8. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the freewheeling diode operates with the far-end sampling line connected in reverse.
9. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the first thermistor and the second thermistor work under the condition that the remote sampling lines are reversely connected.
10. The dc power supply remote voltage drop compensation circuit of claim 1, wherein: the other ends of the first pull-up resistor and the second pull-up resistor are also coupled to an ADC as sampling voltages.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321445762.3U CN220254350U (en) | 2023-06-08 | 2023-06-08 | Far-end voltage drop compensation circuit of direct-current power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321445762.3U CN220254350U (en) | 2023-06-08 | 2023-06-08 | Far-end voltage drop compensation circuit of direct-current power supply |
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| CN220254350U true CN220254350U (en) | 2023-12-26 |
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| CN202321445762.3U Active CN220254350U (en) | 2023-06-08 | 2023-06-08 | Far-end voltage drop compensation circuit of direct-current power supply |
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