CN208738832U - A kind of test power supply with telemetry function - Google Patents
A kind of test power supply with telemetry function Download PDFInfo
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- CN208738832U CN208738832U CN201821381192.5U CN201821381192U CN208738832U CN 208738832 U CN208738832 U CN 208738832U CN 201821381192 U CN201821381192 U CN 201821381192U CN 208738832 U CN208738832 U CN 208738832U
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- telemetering
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Abstract
The utility model discloses a kind of test power supply with telemetry function, including error amplifying circuit, local sample circuit, telemetering sample circuit, voltage compensating circuit, selection switch, the utility model increases a voltage compensating circuit in test power supply, so that test power supply is not in the case where telemetering end (sense) connects or be reversely connected, utilize local output sampling and the output of the voltage compensating circuit, the voltage of load end can accurately be obtained, and the excessively high any device of damage of local output voltage is not will lead to, circuit output can be effectively protected, increase power supply reliability energy.
Description
Technical field
The utility model relates to test power technique fields, and in particular to a kind of test power supply with telemetry function.
Background technique
Test power supply currently on the market largely has telemetry function (sense function), and telemetry function can make load two
The precision of voltage regulation at end is maintained in the specification of technical requirements.When the distance between power supply and load to be measured are remote, load current is big, even
Connect loop pressure drop it is big in the case where, can directly be detected by the end telemetering sense load both ends voltage, to ensure its lasting accuracy.
Fig. 1 is detection wiring diagram.Electric current very little compared with load line, on the line of telemetering end.It is distant when loading the voltage decline at both ends
The signal for surveying end feedback can make power supply generate the response that a voltage rises, thus compensate for the decline of load both end voltage.?
Resistance R2, R3 are accessed between the corresponding voltage output end of voltage and telemetering end, when can prevent telemetering end from opening a way, output voltage is excessively high
Rise.
Fig. 2 is the circuit diagram of power supply distal end sampling in the prior art, and sense circuit is to be connected to local Vo by a resistance
It exports, connects resistance R2 in figure between the anode of Vs and the anode of Vo, resistance R3 is connected between the negative terminal of Vs and the negative terminal of Vo,
Vs carries out difference sampling by OP07, then carries out error amplification by U2B error amplifier, feeds back to power supply, controls power supply
Output.This circuit is simply realized well, but a disadvantage is that R2, R3 resistance can damage when sense is reversely connected or does not connect, this
Scheme is only suitable for will not be in wrong scheme in SENSE.
Summary of the invention
In view of the above problems, the purpose of this utility model is to provide a kind of test circuit, even if telemetering SENSE is terminated
Mistake can also ensure the not too high rising of output voltage, ensure the safety of test.
The utility model specifically adopts the following technical scheme that
A kind of test power supply with telemetry function, including error amplifying circuit, it is characterised in that further include:
One local sample circuit, for carrying out difference sampling to test power output end voltage；
One telemetering sample circuit, for carrying out difference sampling to test power supply telemetering end voltage；
One voltage compensating circuit is connected between local sample circuit and the output end of telemetering sample circuit, for compensating
The pressure drop of load end when telemetering end is reversely connected or does not connect；
One selection switch, for connecting the output of local sample circuit or telemetering sample circuit under external signal control
To the error amplifying circuit.
The utility model increases a voltage compensating circuit in test power supply, so that test power supply is at telemetering end
(sense) it in the case where not connecing or be reversely connected, using local output sampling and the output of the voltage compensating circuit, can accurately obtain
The voltage of load end, and not will lead to the excessively high any device of damage of local output voltage, circuit output can be effectively protected,
Increase power supply reliability energy.
Detailed description of the invention
Fig. 1 is existing detection wiring diagram；
Fig. 2 is the circuit diagram of existing power supply distal end sampling；
Fig. 3 is one structure chart of embodiment.
Fig. 4 is two structure chart of embodiment.
Fig. 5 is embodiment three-circuit schematic diagram.
Specific embodiment
The technical solution of the utility model is described in further detail with reference to the accompanying drawing:
Embodiment one
As shown in figure 3, a kind of test power supply with telemetry function, including local sample circuit (Vo sampling), telemetering sampling
Circuit (Vs sampling), subtraction circuit, selection switch and error amplifier.Vo sample circuit is used for test power output end electricity
Pressure carries out difference sampling, and Vs sample circuit is used to carry out difference sampling to test power supply telemetering end (end sense) voltage.Subtracter
The pressure drop of load end when circuit is used to compensate the reversal connection of telemetering end or does not connect, output end output voltage is equal to the reversal connection of telemetering end or not
The voltage of load input terminal when connecing.There are two connecting pins for subtraction circuit tool, are separately connected Vo sample circuit and Vs sample circuit
Output end.The output end of Vo sample circuit and Vs sample circuit is respectively connected to the stationary contact of selection switch, and selection switch exists
Under external signal control, the output of Vo sample circuit, Vs sample circuit or subtraction circuit is sent to test power supply and is controlled back
Error amplifier in road.
Embodiment two
As shown in figure 4, the present embodiment is similar to one structure of embodiment, the difference is that with a diode in place subtraction
Device circuit, the output end of the anode connection Vo sample circuit of diode, cathode connect the output end of Vs sample circuit.
Embodiment one is suitable for any power circuit, and pressure drop when sense does not connect or is reversely connected is compensated by subtracter, real
Applying example two can be used for low-tension supply, and offset voltage is fixed, and when sense does not connect or is reversely connected, offset voltage is non-adjustable.
Embodiment three
As shown in figure 5, to realize the schematic diagram for testing the test circuit of power supply with telemetry function using subtraction circuit.
The test circuit of the present embodiment includes the first amplifier U1 (op07) and the second amplifier U2 (op07), the first amplifier U1
The end input terminal connecting test power supply telemetering sense, for test power supply telemetering end voltage Vs carry out difference sampling；Second fortune
The input terminal connecting test power output end of U2 is put, for carrying out difference sampling to test power output end voltage Vo.
Testing circuit includes subtraction circuit, mainly by third amplifier (TL0821D) and the 4th resistance R4 being serially connected,
5th resistance R5 composition, the output end (6 foot) of the first amplifier U1 are connected to third amplifier (TL0821D) through first resistor R1
Inverting input terminal.The output end of second amplifier U2 is connected to the non-inverting input terminal of third amplifier U3B, the second fortune through the 5th resistance R5
The power supply negative terminal for putting U2 connects -5V power supply.4th resistance R4 is not connected to -5V power supply with the 5th resistance R5 other end connecting.
The output end of third amplifier U3B is connected to its inverting input terminal through first diode D1,3rd resistor R3.
Testing circuit includes relay (RY210024), and the inverting input terminal of third amplifier U3B is connected to relay K1's
One stationary contact (5 foot), the output end of the second amplifier U2 are connected to another stationary contact (4 foot) of relay K1, relay K1
Movable contact (3 foot) be connected to test power supply control loop in error amplifier U4B inverting input terminal, error amplifier U4B
Non-inverting input terminal connection DAC benchmark output.The control terminal of relay K1 connects sampling control signal, is divided into Vs sampling and Vo is adopted
Sample control.
Circuit operation principle:
Under Vo normal mode, Vo sampling is sampled by the second amplifier U2 difference, and the output of 6 foot of U2 passes through 4 feet of relay K1
It is attached directly to 6 feet of error amplifier U4B.
Under Vs normal mode (sense mode), Vs sampling by the first amplifier U1 difference sample, 6 foot of U1 output by after
5 feet of electric appliance K1 are attached directly to 6 feet of error amplifier U4B.
Under Vs abnormal patterns, i.e. the end Vs reversal connection or hanging, the electricity that Vo output passes through the second amplifier U2 difference sampling 6 feet of output
Pressure, the 4th resistance R4, the 5th resistance R5 partial pressure value be negative, U2 sample 6 foot voltages by resistance R4, R5 partial pressure, obtain third
The 5 foot voltages of amplifier U3B are higher than 6 foot voltage of the first amplifier U1 in Vs sample circuit, and the 5 foot voltages of third amplifier U3B are approximate
The 6 foot voltages equal to U3B, 6 foot voltages, that is, subtracter output of U3B is exported through relay K1 at this time, goes driving error amplification
6 feet of device U4B, and Vs sample circuit does not export.The amplification factor that the 5 foot voltage values of third amplifier U3B are exported multiplied by Vs sampling
Offset voltage is just obtained, obtained offset voltage adds the voltage that output voltage is exactly load end when sense does not connect or is reversely connected,
Essence is that Vo sampled voltage subtracts a voltage to compensate the reversal connection of the end sense or hanging voltage.
It should be noted that, R2, R3 in the present embodiment are not R2, R3 in the prior art (Fig. 2), practical new using this
After type technical solution, former R2, R3 no longer need.
Claims (8)
1. a kind of test power supply with telemetry function, including error amplifying circuit, it is characterised in that further include:
One local sample circuit, for carrying out difference sampling to test power output end voltage；
One telemetering sample circuit, for carrying out difference sampling to test power supply telemetering end voltage；
One voltage compensating circuit is connected between local sample circuit and the output end of telemetering sample circuit, for compensating telemetering
The pressure drop of load end when end is reversely connected or does not connect；
One selection switch, under external signal control, connecting the output of local sample circuit or telemetering sample circuit to institute
State error amplifying circuit.
2. the test power supply with telemetry function as described in claim 1, it is characterised in that the voltage compensating circuit is by subtraction
Device circuit composition.
3. the test power supply with telemetry function as claimed in claim 2, it is characterised in that the subtraction circuit includes one
Operational amplifier and two resistance being serially connected, one end of resistance cascaded structure are connected to the output end of local sample circuit,
The other end connects a negative supply, and the series connection point of two resistance is connected to the non-inverting input terminal of operational amplifier；Telemetering sampling electricity
The output end on road is connected to the inverting input terminal of operational amplifier through a resistance；The output end of operational amplifier through a diode,
One resistance is connected to its inverting input terminal.
4. the test power supply with telemetry function as claimed in claim 3, it is characterised in that the negative supply is by local sampling electricity
The negative supply of difference amplifier provides in road.
5. the test power supply with telemetry function as claimed in claim 2, it is characterised in that the voltage compensating circuit is by two poles
Pipe composition, the anode of diode connect the output end of local sample circuit, and cathode connects the output end of telemetering sample circuit.
6. the test power supply with telemetry function as described in claim 1, it is characterised in that described to select switch for relay, institute
Relay is stated with a movable contact and at least two stationary contacts, the output end difference of the local sample circuit and telemetering sample circuit
Two stationary contacts of relay are connected to, the movable contact of the relay is connected to error amplification in test power supply control loop
Device；The control terminal of the relay connects sampling control signal.
7. the test power supply with telemetry function as described in claim 1, it is characterised in that the output of the voltage compensating circuit
End output voltage is equal to the voltage of load input terminal when telemetering end is reversely connected or does not connect.
8. the test power supply with telemetry function as described in claim 1, it is characterised in that the control signal includes VS sampling
Signal and VO sampling control signal are controlled, when controlling signal is VS sampling control signal, the output of telemetering sample circuit is to accidentally
The output of poor amplifying circuit or voltage compensating circuit is to error amplifying circuit, when controlling signal is VO sampling control signal, this
The output of ground sample circuit is to error amplifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821381192.5U CN208738832U (en) | 2018-08-27 | 2018-08-27 | A kind of test power supply with telemetry function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821381192.5U CN208738832U (en) | 2018-08-27 | 2018-08-27 | A kind of test power supply with telemetry function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208738832U true CN208738832U (en) | 2019-04-12 |
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ID=66031173
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821381192.5U Active CN208738832U (en) | 2018-08-27 | 2018-08-27 | A kind of test power supply with telemetry function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808628A (en) * | 2018-08-27 | 2018-11-13 | 艾乐德电子（南京）有限公司 | A kind of test power supply with telemetry function |
-
2018
- 2018-08-27 CN CN201821381192.5U patent/CN208738832U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108808628A (en) * | 2018-08-27 | 2018-11-13 | 艾乐德电子（南京）有限公司 | A kind of test power supply with telemetry function |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ADEX Electronics (Nanjing) Co.,Ltd. Assignor: AILEDE ELECTRONIC (NANJING) Co.,Ltd. Contract record no.: X2020980004658 Denomination of utility model: A test power supply with telemetry function Granted publication date: 20190412 License type: Common License Record date: 20200803 |