CN211785746U - Accurate testing arrangement of transient voltage under pulse load - Google Patents
Accurate testing arrangement of transient voltage under pulse load Download PDFInfo
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- CN211785746U CN211785746U CN201922376784.9U CN201922376784U CN211785746U CN 211785746 U CN211785746 U CN 211785746U CN 201922376784 U CN201922376784 U CN 201922376784U CN 211785746 U CN211785746 U CN 211785746U
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Abstract
The utility model discloses a transient voltage accurate testing device under pulse load in the field of power supply testing, which comprises a program-controlled direct-current power supply, wherein the program-controlled direct-current power supply is connected with a tested power supply with a load and provides electric energy; the electronic load is connected with the trigger signal functional circuit and is used for outputting pulse current; the trigger signal function circuit is connected with a load output circuit of the power supply to be detected in series and is connected with the signal acquisition device; the pulse current generates a trigger signal through the trigger signal functional circuit, and the signal acquisition device is triggered to acquire the transient input end voltage and output end voltage of the load side of the power supply to be detected; and the upper computer is connected with and controls the parameter state values of the program-controlled direct-current power supply, the electronic load and the signal acquisition device. The utility model discloses can detect the output voltage of power module after getting rid of the fuel effect influence fast accurately, extensive applicability, detection efficiency is high, has the progress that is showing.
Description
Technical Field
The utility model relates to a power test field specifically is an accurate testing arrangement of transient voltage under pulse load.
Background
The low-voltage large-current power supply module has the characteristics of low output voltage and large current, particularly in the field of low-dropout linear power Supplies (LDOs), the local temperature rise of the module is too fast under the condition of normal temperature and heavy load, the rapid change of the equivalent test environment temperature can be caused, the semiconductor characteristic is influenced, the low-voltage large-current power supply module is equivalent to the test of the module under the condition of local high temperature, and the condition of normal temperature test is not preset. Therefore, in order to eliminate the interference of the effect, the time for overloading maintenance is small enough, so that the output voltage is tested under the condition that the local temperature rise of the module can be ignored in a very short time, namely the overloading output voltage in the real normal-temperature environment state, and a special method and means are needed to ensure the reality, effectiveness and accuracy of the output voltage. Therefore, it is necessary to eliminate the temperature influence and accurately measure the heavy-load output voltage condition of the power module in the real normal temperature environment state.
In view of this, the applicant proposed a device for accurately testing transient voltages under pulsed load.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an accurate testing arrangement of transient voltage under the pulse load to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the device for accurately testing the transient voltage under the pulse load comprises a program-controlled direct-current power supply, a power supply and a power supply controller, wherein the program-controlled direct-current power supply is connected with a tested power supply with a load and provides electric energy; the electronic load is connected with the trigger signal functional circuit and is used for outputting pulse current; the trigger signal function circuit is connected with a load output circuit of the power supply to be detected in series and is connected with the signal acquisition device; the pulse current generates a trigger signal through the trigger signal functional circuit, and the signal acquisition device is triggered to acquire the transient input end voltage and output end voltage of the load side of the power supply to be detected; and the upper computer is connected with and controls the parameter state values of the program-controlled direct-current power supply, the electronic load and the signal acquisition device.
As an improvement of the present invention, in order to further facilitate the conversion of the pulse signal by the trigger signal functional circuit, the trigger signal functional circuit includes an induction coil N, the primary winding Npp of the induction coil N is connected in series with the load output circuit of the power supply to be tested, and the dotted end of the secondary winding Nss thereof is connected to the anode end of the diode V2 and the cathode end of the diode V3; the cathode end of the diode V2 is connected with the resistor R1 in series and then connected to the base electrode of the triode V1, and the anode end of the diode V3 is connected with the resistor R3 in series and then connected to the non-dotted end of the secondary winding NSS; a capacitor C and a resistor R2 are connected in parallel between the cathode end of the diode V2 and the non-dotted end of the secondary winding NSS, the non-dotted end of the primary winding is connected with the emitter of the triode V1, and the collector and the emitter of the triode V1 are respectively connected with a signal acquisition device.
As the utility model discloses an improvement scheme, in order to be convenient for further signal acquisition device gathers transient voltage, signal acquisition device includes digital multimeter, digital multimeter's outside trigger terminal's positive negative pole is connected with triode V1's collecting electrode, projecting pole respectively.
As the utility model discloses an improvement scheme, in order to be convenient for further through the parameter of host computer adjustment electronic load, programme-controlled direct current module and signal acquisition device, the host computer is including being used for the adjustment programme-controlled direct current power supply, electronic load and signal acquisition device parameter state's human-computer interaction panel and bottom test program unit, bottom test program includes that electronic load sets up and triggers instruction module, digital multimeter parameter setting and data reading module.
Has the advantages that: the utility model is suitable for a power module tests its transient state output voltage under taking the ms level pulse load condition, can detect the output voltage of power module after getting rid of the fuel effect influence fast accurately, extensive applicability, detection efficiency is high, has apparent progress.
Drawings
FIG. 1 is a block diagram of the test of the present invention;
FIG. 2 is a functional circuit diagram of the trigger signal of the present invention;
FIG. 3 is a diagram of the man-machine interaction panel of the present invention;
fig. 4 is a logic sequence diagram during testing of the present invention.
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 work belong to the protection scope of the present invention.
In this embodiment, the upper computer sets parameters, controls the electronic load to generate an ms-level pulse load, and directly generates a pulse current. The electronic load in this embodiment is set to a dynamic mode, in which a pulse dynamic mode is selected, and then parameters of the pulse current can be set: start value, end value, pulse maximum value, and time parameter: a pulse width value.
Then the upper computer makes the electronic load send out a trigger instruction, the electronic load sends out corresponding pulse current according to the set parameters, and the maximum current slope of the electronic load is not less than 5 multiplied by 105And A/s, the pulse load current is converted into a trigger signal by the trigger signal functional circuit, the ms-level transient signal acquisition is carried out by the signal acquisition device, and the test result is displayed on the upper computer.
Further, as shown in fig. 2, the trigger signal function circuit includes an induction coil N, a primary winding Npp of the induction coil N is connected in series with a load output loop of the power supply to be measured, and a dotted terminal of a secondary winding Nss thereof is connected to an anode terminal of a diode V2 and a cathode terminal of a diode V3; the cathode end of the diode V2 is connected with the resistor R1 in series and then connected to the base electrode of the triode V1, and the anode end of the diode V3 is connected with the resistor R3 in series and then connected to the non-dotted end of the secondary winding NSS; a capacitor C and a resistor R2 are connected in parallel between the cathode end of the diode V2 and the non-dotted end of the secondary winding NSS, the non-dotted end of the primary winding is connected with the emitter of the triode V1, and the collector and the emitter of the triode V1 are respectively connected with a signal acquisition device.
An induction coil N in the trigger signal functional circuit is used for converting a pulse current signal into a high-level voltage signal, the high-level signal drives a triode V1 to be conducted, and a falling edge signal is generated to trigger the signal acquisition device to acquire signals.
In this embodiment, the output of the circuit to be tested is reloaded to 5A, and the corresponding primary-secondary winding turn ratio typical value of the induction coil N is 2: 100. When the output overload is other value (or more than 5A, or less than 5A), the turn ratio value needs to be adjusted correspondingly.
Furthermore, the signal acquisition device comprises a digital multimeter, and the positive electrode and the negative electrode of an external trigger terminal of the digital multimeter are respectively connected with the collector electrode and the emitter electrode of the triode V1. The digital multimeter can be provided with a plurality of external trigger ports, the positive electrode and the negative electrode of the external trigger terminal of the digital multimeter are respectively connected with the collector electrode and the emitter electrode of the triode V1, each digital multimeter respectively collects a transient voltage parameter of the load side of the power supply to be detected, and the measurement integration time of the digital multimeter has the capability of being not more than 0.02 PLC.
In the embodiment, the capacity of measuring the integration time of the digital multimeter is preferably set to be 0.02PLC, the voltage within 5ms can be accurately tested, other PLC such as 0.1PLC and 1PLC are selected, the test effect is poor, the too long integration time exceeds 5ms, the weight of the effective voltage value measured at the load side of the power supply to be tested contains the voltage value outside 5ms, and the measured voltage is diluted by the voltage outside 5ms, so that the error is large.
Further, referring to fig. 3, the upper computer includes a human-computer interaction panel and a bottom layer test program unit, the human-computer interaction panel is used for adjusting parameter states of the program-controlled dc power supply, the electronic load and the signal acquisition device, the human-computer interaction panel includes an address setting control (instrument address), a parameter setting control (parameter setting), a program error detection control (error output) and a test result display control (test result), and the bottom layer test program includes an electronic load setting and triggering instruction module, a digital multimeter parameter setting and a data reading module.
As shown in fig. 4, the working principle of this embodiment includes the following steps:
s1: the program-controlled direct-current power supply provides electric energy, and the tested power supply enters a working mode under normal no-load or light load; the difference of the output current jump of the tested power supply under normal no-load or light load is not more than 5A.
S2: the upper computer controls the electronic load to output pulse current which accords with a preset value, and the pulse current generates a trigger signal through the trigger signal functional circuit;
s3: under the trigger of the trigger signal, the signal acquisition device acquires the value of the transient input voltage Vin at the load side of the power supply to be detected, namely the voltage of the test point during the pulse load period;
s4: and changing the detected power supply to be in a heavy load state, controlling the voltage applied to the detected power supply by the program-controlled direct-current power supply by the upper computer, repeating the steps from S2 to S3, and calibrating the transient input voltage Vin at intervals to keep the voltage stable and meet the requirement in the heavy load state.
Because a certain voltage difference exists between the load side of the power source to be detected and the power supply side of the power source to be detected, when the power supply voltage provided by the program-controlled direct-current power supply to the power source to be detected is smaller, the voltage difference value from the power supply side of the power source to be detected to the load side is larger, so that the transient input voltage Vin at the load side is smaller in a heavy load state, and the load cannot normally operate. After the signal acquisition device acquires the transient input voltage Vin, the transient input voltage Vin is fed back to the upper computer, the upper computer controls the program-controlled direct-current power supply to increase the voltage of the power supply to be tested, so that the power supply to be tested can support the stable operation of a load in a heavy-load state, and even if the transient input voltage Vin is stably maintained and meets the requirement in the heavy-load state, the test on the transient output voltage Vo can be started.
S5: and acquiring an output end voltage value Vo of the load side of the power supply to be detected through a signal acquisition device, wherein the output end voltage value Vo at the moment is the transient output voltage under the load pulse condition.
The utility model is suitable for a power module tests its transient state output voltage under taking the ms level pulse load condition, can detect the output voltage of power module after getting rid of the fuel effect influence fast accurately, extensive applicability, detection efficiency is high, has apparent progress.
Although the present description is described in terms of embodiments, not every embodiment includes only a single embodiment, and such description is for clarity only, and those skilled in the art should be able to integrate the description as a whole, and the embodiments can be appropriately combined to form other embodiments as will be understood by those skilled in the art.
Therefore, the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application; all changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (4)
1. The device for accurately testing the transient voltage under the pulse load is characterized by comprising a program-controlled direct-current power supply, wherein the program-controlled direct-current power supply is connected with a tested power supply with a load and provides electric energy; the electronic load is connected with the trigger signal functional circuit and outputs pulse current; the trigger signal function circuit is connected with a load output circuit of the power supply to be detected in series and is connected with the signal acquisition device; the pulse current generates a trigger signal through a trigger signal functional circuit, and the signal acquisition device is triggered to acquire the transient input end voltage and output end voltage of the load side of the power supply to be detected; and the upper computer is connected with and controls the parameter state values of the program-controlled direct-current power supply, the electronic load and the signal acquisition device.
2. The device for accurately testing the transient voltage under the pulse load of claim 1, wherein the trigger signal function circuit comprises an induction coil N, a primary winding Npp of the induction coil N is connected in series with a load output loop of the power supply to be tested, and a dotted terminal of a secondary winding NSS of the induction coil N is connected to an anode terminal of a diode V2 and a cathode terminal of a diode V3; the cathode end of the diode V2 is connected with the resistor R1 in series and then connected to the base electrode of the triode V1, and the anode end of the diode V3 is connected with the resistor R3 in series and then connected to the non-dotted end of the secondary winding NSS; a capacitor C and a resistor R2 are connected in parallel between the cathode end of the diode V2 and the non-dotted end of the secondary winding Nss, the non-dotted end of the primary winding Npp is connected with the emitter of the triode V1, and the collector and the emitter of the triode V1 are respectively connected with a signal acquisition device.
3. The device for accurately testing the transient voltage under the pulse load according to claim 1, wherein the signal acquisition device comprises a digital multimeter, and the anode and the cathode of an external trigger terminal of the digital multimeter are respectively connected with the collector and the emitter of the triode V1.
4. The device for accurately testing the transient voltage under the pulse load according to claim 3, wherein the upper computer comprises a human-computer interaction panel for adjusting the parameter states of the program-controlled DC power supply, the electronic load and the signal acquisition device and a bottom layer test program unit, and the bottom layer test program comprises an electronic load setting and triggering instruction module, a digital multimeter parameter setting and data reading module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922376784.9U CN211785746U (en) | 2019-12-24 | 2019-12-24 | Accurate testing arrangement of transient voltage under pulse load |
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| CN201922376784.9U CN211785746U (en) | 2019-12-24 | 2019-12-24 | Accurate testing arrangement of transient voltage under pulse load |
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| CN211785746U true CN211785746U (en) | 2020-10-27 |
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