CN211454405U - Input voltage regulating circuit for testing electric vehicle instrument - Google Patents
Input voltage regulating circuit for testing electric vehicle instrument Download PDFInfo
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- CN211454405U CN211454405U CN202020540108.0U CN202020540108U CN211454405U CN 211454405 U CN211454405 U CN 211454405U CN 202020540108 U CN202020540108 U CN 202020540108U CN 211454405 U CN211454405 U CN 211454405U
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Abstract
The utility model relates to a voltage regulation circuit field discloses an input voltage regulating circuit for electric motor car instrument test, including power input end, model for LM2576 HV's power chip, the energy storage unit of being connected with power chip's No. 2 pin electricity, be connected and to power chip input feedback voltage's voltage feedback unit with energy storage unit's output electricity, the first regulating element and the second regulating element of regulating voltage feedback unit input power chip feedback voltage size, power input end electricity connection power chip's No. 1 pin. The input feedback voltage of the power supply chip can be changed through the first adjusting unit and the second adjusting unit to change the output voltage of the power supply chip, so that the output voltage is adjustable, and the test requirement is met.
Description
Technical Field
The utility model relates to a voltage regulating circuit field, concretely relates to input voltage regulating circuit for electric motor car instrument test.
Background
After the production of the electric vehicle instrument panel is finished, functional tests are required, and the functional tests comprise inputting voltage values of different specifications into the electric vehicle instrument panel to detect whether each part of components of the electric vehicle instrument panel can normally work, such as whether luminous signs of a front lamp and left and right steering lamps normally display and whether electric quantity display of an electric vehicle storage battery is normal. However, the output voltage of the existing testing device can not be directly adjusted, and the existing testing device needs to be matched with a direct-current voltage-stabilizing adjustable power supply for use, and has the advantages of large occupied testing area, high cost and lower efficiency.
SUMMERY OF THE UTILITY MODEL
In view of the not enough of background art, the utility model provides an input voltage regulating circuit for electric motor car instrument test, the technical problem that solve is that current testing arrangement's output voltage can not the direct regulation.
For solving the technical problem, the utility model provides a following technical scheme: the utility model provides an input voltage regulating circuit for electric motor car instrument test, includes power input end, the power chip that the model is LM2596HV-ADJ, the energy storage unit of being connected with power chip's No. 2 pins electricity, the voltage feedback unit that is connected with energy storage unit's output electricity and inputs feedback voltage to power chip, first regulating element and the second regulating element of regulation voltage feedback unit input power chip feedback voltage size, power input end electricity is connected with power chip's No. 1 pin.
Further, in order to ensure that the power supply voltage connected to the first pin of the power supply chip is stable, the power supply input end is grounded through a filter capacitor C1.
Further, the energy storage unit comprises a diode D1 and an inductor L1, a second pin of the power chip is electrically connected with a cathode of the diode D1 and one end of the inductor L1, an anode of the diode D1 is grounded, and the other end of the inductor L1 is electrically connected with the voltage feedback unit.
The voltage feedback unit comprises resistors R1 and R2, the other end of the inductor L1 is connected with one end of a resistor R1, the other end of the resistor R1 is respectively and electrically connected with one end of a resistor R2 and the No. 4 pin of the power chip, and the other end of the resistor R2 is grounded.
The first adjusting unit comprises a first adjusting signal input end, resistors R3 and R4 and a triode Q1, wherein a collector of the triode Q1 is electrically connected with a No. 4 pin of a power supply chip through a resistor R4, a base of the triode Q1 is electrically connected with the first adjusting signal input end through a resistor R3, and an emitter of the triode Q1 is grounded; the second adjusting unit comprises a second adjusting signal input end, a resistor R5, R6, R7, a capacitor C4, C5 and a voltage follower, wherein the forward input end of the voltage follower is respectively and electrically connected with one end of a resistor R7 and one end of a capacitor C5, the other end of the resistor R7 is respectively and electrically connected with one end of a resistor R6 and one end of a capacitor C4, the other end of the resistor R6 is electrically connected with the second adjusting signal input end, the other end of the capacitor C5 and the other end of the capacitor C4 are both grounded, and the No. 4 pin of the power chip is electrically connected with the output end of the voltage follower through a resistor R685.
In order to ensure the voltage output by the energy storage unit to be stable, the other end of the inductor L1 is also electrically connected with one end of the capacitor C2 and the anode of the electrolytic capacitor C3, the other end of the capacitor C2 is electrically connected with the No. 4 pin of the power supply chip, and the cathode of the electrolytic capacitor C3 is grounded.
Compared with the prior art, the utility model beneficial effect who has is: when the power supply chip works, if a high-level signal is input at the first adjusting signal input end, the triode Q1 is conducted, the resistor R3 is connected with the resistor R4 in parallel, and the feedback voltage input by the No. 4 pin of the power supply chip is changed, so that the output voltage of the power supply chip can be adjusted by changing the resistance values of the resistors R1, R3 and R4; if during the second adjustment signal input end input signal, the voltage amplitude of voltage follower output is the same with input signal's amplitude, because the inductance L1 other end passes through resistance R1 and the output of R5 electricity connection voltage follower, when the voltage amplitude of the output of voltage follower changes, the feedback voltage of power chip 4 pin input changes, and its output voltage can make corresponding change according to power chip's theory of operation when power chip's feedback voltage changes, consequently the utility model discloses can change power chip's output voltage on a large scale through first regulating element at the during operation, through the output voltage of second regulating element sub-range regulation power chip, it is adjustable to realize electric vehicle instrument's test voltage, satisfies the test demand.
Drawings
The utility model discloses there is following figure:
fig. 1 is a block diagram of the circuit structure of the present invention;
fig. 2 is a circuit diagram of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, an input voltage adjusting circuit for testing an electric vehicle instrument includes a power input end V1, a power chip U1 with a model of LM2596HV-ADJ, an energy storage unit 10 electrically connected to pin No. 2 of the power chip U1, a voltage feedback unit 11 electrically connected to an output end of the energy storage unit 10 and inputting a feedback voltage to the power chip U1, a first adjusting unit 12 and a second adjusting unit 12 for adjusting the voltage feedback unit 11 to input the feedback voltage of the power chip U1, and the power input end V1 is electrically connected to pin No. 1 of the power chip U1.
As shown in fig. 2, in order to ensure that the power supply voltage connected to pin one of the power chip U1 is stable, the power input terminal V1 is grounded through the filter capacitor C1.
The energy storage unit 10 comprises a diode D1 and an inductor L1, a second pin of the power chip U1 is electrically connected to a cathode of the diode D1 and one end of the inductor L1, an anode of the diode D1 is grounded, and the other end of the inductor L1 is electrically connected to the voltage feedback unit 11.
The voltage feedback unit 11 comprises resistors R1 and R2, the other end of the inductor L1 is connected to one end of a resistor R1, the other end of the resistor R1 is electrically connected to one end of a resistor R2 and the pin No. 4 of the power chip, and the other end of the resistor R2 is grounded.
The first adjusting unit 12 comprises a first adjusting signal input terminal SEL, resistors R3 and R4 and a transistor Q1, wherein the collector of the transistor Q1 is electrically connected with the pin 4 of the power supply chip U1 through a resistor R4, the base of the transistor Q1 is electrically connected with the first adjusting signal input terminal SEL through a resistor R3, and the emitter of the transistor Q1 is grounded.
The second adjusting unit 13 includes a second adjusting signal input terminal PWM, resistors R5, R6, R7, capacitors C4, C5 and a voltage follower U2, a forward input terminal of the voltage follower U2 is electrically connected to one end of a resistor R7 and one end of a capacitor C5 respectively, the other end of a resistor R7 is electrically connected to one end of a resistor R6 and one end of a capacitor C4 respectively, the other end of a resistor R6 is electrically connected to the second adjusting signal input terminal PWM, the other end of a capacitor C5 and the other end of a capacitor C4 are both grounded, and a pin No. 4 of the power chip U1 is electrically connected to an output terminal of the voltage follower U2 through a resistor R5.
In order to ensure the voltage output by the energy storage unit 10 to be stable, the other end of the inductor L1 is further electrically connected with one end of the capacitor C2 and the anode of the electrolytic capacitor C3, the other end of the capacitor C2 is electrically connected with the pin No. 4 of the power supply chip U1, and the cathode of the electrolytic capacitor C3 is grounded.
The utility model discloses the theory of operation is as follows, when first regulation signal input SEL input high level signal, triode Q1 switches on, and resistance R3 and R4 are parallelly connected, and the feedback voltage of power chip U1's No. 4 pin input changes this moment, consequently can adjust power chip's output voltage through the resistance that changes resistance R1, R3 and R4; when the second adjustment signal input end input signal, the voltage amplitude of voltage follower U2 output is the same with input signal's amplitude, because the inductance L1 other end passes through resistance R1 and the output of R5 electricity connection voltage follower U2, when the voltage amplitude of voltage follower U2's output changes, the feedback voltage of power chip U14 number pin input changes, and its output voltage can make corresponding change according to power chip U1's theory of operation when power chip U1's feedback voltage changes, consequently the utility model discloses can change power chip's output voltage on a large scale through first regulating unit 12 at the during operation, through the output voltage of second regulating unit 13 small-range regulation power chip, it is adjustable to realize electric vehicle instrument's test voltage, satisfies the test demand.
In this embodiment, the first regulating unit 12 can regulate the output voltage of the pin 4 of the power chip U1 to 12V and 48V. When the first adjusting unit 12 adjusts the output voltage of the pin No. 4 of the power chip U1 to 12V, the second adjusting unit 13 adjusts the output voltage of the power chip U1 among 10V to 14V. When the first regulating unit 12 regulates the output voltage of pin 4 of the power chip U1 to 48V, the second regulating unit 13 regulates the output voltage of the power chip U1 from 40V to 50V, thereby meeting the test requirement.
In light of the above, the present invention is not limited to the above embodiments, and various changes and modifications can be made by the worker without departing from the scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (6)
1. An input voltage regulating circuit for testing an electric vehicle meter, characterized in that: the power supply comprises a power supply input end, a power supply chip with the model of LM2596HV-ADJ, an energy storage unit electrically connected with a No. 2 pin of the power supply chip, a voltage feedback unit electrically connected with the output end of the energy storage unit and used for inputting feedback voltage to the power supply chip, a first adjusting unit and a second adjusting unit used for adjusting the feedback voltage of the power supply chip input by the voltage feedback unit, wherein the power supply input end is electrically connected with the No. 1 pin of the power supply chip.
2. The input voltage regulation circuit for electric vehicle instrumentation of claim 1, wherein: the power input is also connected to ground through a filter capacitor C1.
3. The input voltage regulation circuit for electric vehicle instrumentation of claim 1, wherein: the energy storage unit comprises a diode D1 and an inductor L1, a No. 2 pin of the power chip is electrically connected with the cathode of the diode D1 and one end of the inductor L1 respectively, the anode of the diode D1 is grounded, and the other end of the inductor L1 is electrically connected with the voltage feedback unit.
4. The input voltage regulation circuit for electric vehicle instrumentation of claim 3, wherein: the voltage feedback unit comprises resistors R1 and R2, the other end of the inductor L1 is connected with one end of a resistor R1, the other end of the resistor R1 is respectively and electrically connected with one end of a resistor R2 and a No. 4 pin of the power chip, and the other end of the resistor R2 is grounded.
5. The input voltage regulation circuit for electric vehicle instrumentation of claim 4, wherein: the first adjusting unit comprises a first adjusting signal input end, resistors R3 and R4 and a triode Q1, wherein a collector of the triode Q1 is electrically connected with a No. 4 pin of a power supply chip through a resistor R4, a base of the triode Q1 is electrically connected with the first adjusting signal input end through a resistor R3, and an emitter of the triode Q1 is grounded; the second adjusting unit comprises a second adjusting signal input end, resistors R5, R6, R7, capacitors C4, C5 and a voltage follower, wherein a forward input end of the voltage follower is electrically connected with one end of a resistor R7 and one end of a capacitor C5 respectively, the other end of the resistor R7 is electrically connected with one end of a resistor R6 and one end of a capacitor C4 respectively, the other end of the resistor R6 is electrically connected with the second adjusting signal input end, the other end of the capacitor C5 and the other end of the capacitor C4 are grounded, and a No. 4 pin of the power chip is electrically connected with an output end of the voltage follower through a resistor R5.
6. The input voltage regulation circuit for electric vehicle instrumentation of claim 5, wherein: the other end of the inductor L1 is also electrically connected with one end of a capacitor C2 and the anode of an electrolytic capacitor C3, the other end of the capacitor C2 is electrically connected with the No. 4 pin of a power chip, and the cathode of the electrolytic capacitor C3 is grounded.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020540108.0U CN211454405U (en) | 2020-04-13 | 2020-04-13 | Input voltage regulating circuit for testing electric vehicle instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020540108.0U CN211454405U (en) | 2020-04-13 | 2020-04-13 | Input voltage regulating circuit for testing electric vehicle instrument |
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| CN211454405U true CN211454405U (en) | 2020-09-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189470A (en) * | 2021-04-01 | 2021-07-30 | 深圳市广和通无线股份有限公司 | Test circuit, test system and test method |
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- 2020-04-13 CN CN202020540108.0U patent/CN211454405U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113189470A (en) * | 2021-04-01 | 2021-07-30 | 深圳市广和通无线股份有限公司 | Test circuit, test system and test method |
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