CN212622958U - Electric quantity display circuit - Google Patents
Electric quantity display circuit Download PDFInfo
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- CN212622958U CN212622958U CN202020563890.8U CN202020563890U CN212622958U CN 212622958 U CN212622958 U CN 212622958U CN 202020563890 U CN202020563890 U CN 202020563890U CN 212622958 U CN212622958 U CN 212622958U
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Abstract
The utility model discloses a power display circuit. The problem of power display circuit commonly used can not accurate demonstration battery power to and power display circuit commonly used needs a plurality of pins to support after integrated inside the chip, increase cost, practical value is low is solved. The electric quantity display circuit comprises a battery pack, a voltage-current conversion unit and an electric quantity display unit; the voltage and current conversion unit comprises a plurality of comparators corresponding to the electric quantity display stage, a plurality of trigger signal sub-circuits and reference sub-circuits for providing different reference voltages for the comparators, and the electric quantity display unit comprises a plurality of display sub-circuits corresponding to the electric quantity display stage and voltage division sub-circuits for providing different control voltages for the display sub-circuits. The utility model discloses can be accurate and dynamic show battery power, only need provide a pin support after integrated to the chip is inside, reduced integrated chip's manufacturing cost, improved the in-service use and worth.
Description
Technical Field
The utility model belongs to the technical field of the battery technique and specifically relates to an electric quantity display circuit is related to.
Background
The lithium battery needs to display the electric quantity of the battery in daily use. A common electric quantity display circuit is shown in fig. 1, and comprises a plurality of circuits formed by connecting resistors, voltage-regulator tubes and indicator lamps in series and connected to two ends of a battery, wherein when the voltage of the battery rises, the voltage-regulator tubes are broken down, and the indicator lamps are lightened. Different battery electric quantity display values can be obtained by selecting the proper voltage stabilizing value of the voltage stabilizing tube. However, the circuit has the disadvantages that the electric quantity display value is limited by the voltage regulator tube, the battery electric quantity is difficult to accurately display, particularly, dynamic display such as flashing of an indicator lamp is needed during charging, and the circuit display circuit cannot achieve the purpose. When the lithium battery is used, the lithium battery can be provided with a protection chip, if the electric quantity display circuit is integrated in the chip, the defects are easily solved, but another problem is generated, a plurality of indicating lamps need to be provided with a plurality of pins for support, and the pin resources of the integrated circuit are the primary consideration problem in chip design because the number of the pins of the chip is directly related to the cost of the chip and the actual value in use.
Disclosure of Invention
The utility model discloses solved power display circuit commonly used and can not accurate demonstration battery power to and power display circuit commonly used is integrated to need a plurality of pins to support after the chip is inside, and the incremental cost, problem that the actual value is low provides a power display circuit.
The above technical problem of the present invention can be solved by the following technical solutions: a kind of electric quantity display circuit, including assembled battery, voltage current switching unit and electric quantity display element;
the voltage and current conversion unit comprises a plurality of comparators corresponding to the electric quantity display stage, a plurality of trigger signal sub-circuits and reference sub-circuits for providing different reference voltages for the comparators,
the positive input ends of the comparators are respectively connected with the positive electrode end of the battery pack, the negative input ends of the comparators are respectively connected with the corresponding voltage division points of the reference sub-circuit,
each trigger signal sub-circuit is connected in parallel, one end of the connected circuit is connected with a power supply, the other end of the connected circuit is used as a signal output end of the voltage-current conversion unit, each trigger signal sub-circuit comprises a first control switch for controlling the work of the trigger signal sub-circuit, and the output end of each comparator is respectively connected to the control end of the corresponding first control switch;
the electric quantity display unit comprises a plurality of display sub-circuits corresponding to the electric quantity display stage and a voltage division sub-circuit for providing different control voltages for each display sub-circuit,
each display sub-circuit comprises a second control switch for controlling the work of the display sub-circuit, the second control switches are respectively connected to the corresponding voltage division points of the voltage division sub-circuit, and the signal output end of the voltage-current conversion unit is connected with the input end of the voltage division sub-circuit.
The utility model discloses a group battery voltage when detecting to charge, output control signal to circuit display element when reaching the electric quantity stage of charging of setting for, the work of the corresponding display sub-circuit of control is about to the pilot lamp and lights. Every time the battery pack is charged to one stage, the corresponding indicating lamp is lightened, so that the electric quantity of the battery pack can be accurately displayed. The utility model discloses become corresponding voltage electric current conversion unit and electric quantity display element two parts with the circuit design, voltage electric current conversion unit realizes carrying out the flashing control to the circuit display element through a signal output part, is convenient for integrate the integrated chip with voltage electric current conversion unit in, because only a signal output part, only need provide a pin after the integration, has reduced integrated chip's manufacturing cost, has improved use value.
The reference sub-circuit in the scheme is provided with a plurality of voltage division points and can provide different reference voltages, the reverse input ends of the comparators are respectively connected to the corresponding voltage division points to obtain corresponding reference voltages, the comparators control the corresponding trigger signal sub-circuits to conduct and work by comparing with the charging voltage of the battery, and control signals are formed and sent to the electric quantity display unit. The electric quantity display unit comprises a plurality of display sub-circuits corresponding to electric quantity display stages and voltage division sub-circuits, each voltage division sub-circuit is provided with a plurality of voltage division points and provides control voltage for corresponding to the second control switches, the control signals pass through the voltage division sub-circuits and then carry out on-off control on the second control switches, each time the battery pack is charged to one stage, the corresponding second control switches are controlled by the control signals to be conducted, then the corresponding display sub-circuits work, and the corresponding indicator lamps are turned on.
Preferably, the comparator includes a corresponding number of comparators BG1 … BGn according to the set electric quantity display period.
Preferably, the reference sub-circuit comprises a reference voltage source E0, a resistor RE1 … REn corresponding to the electricity display level, the resistor RE1 … REn is connected in series, the circuit is connected to both ends of the reference voltage source E0 after the series connection, the negative pole of the reference voltage source E0 is connected to the negative pole of the battery pack, the inverting input terminal of the comparator BGk is connected to one end of the resistor REk connected to the positive pole of the reference voltage source E0, wherein k =1 … n.
In the scheme, the reference sub-circuit provides reference voltage for each comparator, the resistors RE1 … REN are connected in series, two ends of the circuit after the series connection are respectively connected with two ends of a reference voltage source, and endpoints of the resistors form voltage division points. The resistor RE1 and the resistor REN serve as two-end resistors of the circuit after series connection, one end of the resistor RE1 is connected with the anode of a reference voltage source, the other end of the resistor RE1 is connected with one end of the resistor RE2, one end of the resistor REN is connected with the cathode of the reference voltage source, and the other end of the resistor REN is connected with one end of the resistor REN-1. The resistor REk is connected to the positive terminal of the reference voltage source E0, i.e. the resistor REk is directly connected to the positive terminal of the reference voltage source E0 or connected to the positive terminal of the reference voltage source E0 through a series resistor.
Preferably, the trigger signal sub-circuit includes a MOS transistor Qk and a resistor RHk, where k =1 … n, the first control switch is the MOS transistor Qk, one end of the resistor RHk is connected to the power supply, the other end of the resistor RHk is connected to the source of the MOS transistor Qk, the drain of the MOS transistor Qk is connected to the signal output terminal of the voltage-current conversion unit, and the gate of the MOS transistor Qk is connected to the output terminal of the comparator BGk. According to the scheme, the MOS tube is used as a first control switch to control the on-off of the trigger signal sub-circuit, and when the battery pack is charged to one stage, the corresponding comparator sends a signal to the corresponding first control switch, so that the corresponding trigger signal sub-circuit is switched on, and a control signal is sent to the electric quantity display unit.
As a preferable scheme, the trigger signal sub-circuit includes a MOS transistor Qk and a constant current source IDk, where k =1 … n, the first control switch is the MOS transistor Qk, the positive electrode of the constant current source IDk is connected to the power supply, the negative electrode of the constant current source IDk is connected to the source electrode of the MOS transistor Qk, the drain electrode of the MOS transistor Qk is connected to the signal output end of the voltage-current conversion unit, and the gate electrode of the MOS transistor Qk is connected to the output end of the comparator BGk. According to the scheme, the voltage is connected to the MOS tube after passing through the constant current source to provide constant current, the MOS tube is used as the first control switch to control the on-off of the trigger signal sub-circuit, and when the battery pack is charged to one stage, the corresponding comparator sends a signal to the corresponding first control switch, so that the corresponding trigger signal sub-circuit is switched on, and a control signal is sent to the electric quantity display unit.
Preferably, the voltage divider sub-circuit comprises a resistor RF1 … RFn corresponding to the power display stage, the resistor RF1 … RFn is connected in series, one end of the series circuit is used as the input end of the power display circuit and is connected with the signal output end of the voltage-current conversion circuit, and the other end of the series circuit is grounded. According to the scheme, the number of the resistors of the voltage division circuit is set according to the electric quantity display stage, the resistors are connected in series, and the end points of the resistors form voltage division points. Specifically, a resistor RF1 … RFn is connected in series to form a series circuit, wherein the resistor RF1 and the resistor RFn are resistors at two ends of the series circuit, one end of a resistor RF1 is connected with a signal output end of the voltage-current conversion circuit, the other end of the resistor RF1 is connected with one end of a resistor RF2, one end of the resistor RFn is grounded, and the other end of the resistor RFn is connected with a resistor RFn-1.
Preferably, the display sub-circuit includes a resistor RLk, a light emitting diode LEDk, and a MOS transistor Gk, where k =1 … n, the second control switch is the MOS transistor Gk, one end of the resistor RLk is connected to the power supply, the other end of the resistor RLk is connected to the anode of the light emitting diode LEDk, the cathode of the light emitting diode LEDk is connected to the drain of the MOS transistor Gk, the source of the MOS transistor Gk is grounded, and the gate of the MOS transistor Gk is connected to one end of the resistor RFk connected to the input end of the display circuit. According to the scheme, the number of the display sub-circuits corresponds to the display stages of the circuit, when the display sub-circuit is charged to one stage, the display sub-circuit MOS tube Gk of the corresponding stage detects that the grid voltage meets the conduction requirement, the MOS tube Gk is conducted, the display sub-circuit where the MOS tube Gk is located is conducted, and the light-emitting diode is turned on. The end of the resistor RFk connected with the input end of the circuit display circuit is directly connected with the input end of the circuit display circuit or connected with the input end of the circuit display circuit by connecting other resistors in series.
Preferably, the current display unit further includes an oscillator H, and the oscillator H is connected to the signal output terminal of the voltage-current conversion unit. Each trigger signal sub-circuit is reconnected to signal output part through connecting the oscillator after the parallel connection in this scheme, and signal output part is connected with electric quantity display element, can flash through the pilot lamp of the effect circuit display element of oscillator for can the dynamic display electric quantity when the group battery charges.
Preferably, the display sub-circuit further includes an oscillator Hk, where k =1 … n, one end of the oscillator Hk is connected to the drain terminal of the MOS transistor Qk, and the other end of the oscillator Hk is connected to the signal output terminal of the voltage-to-current conversion unit. This scheme all connects the oscillator on each trigger signal sub-circuit, switches on the back at trigger signal sub-circuit, and the signal conveys to signal output part through the oscillator, and signal output part is connected with electric quantity display element, and the pilot lamp through the effect circuit display element of oscillator can flash for can dynamic display electric quantity when the group battery charges.
Preferably, the voltage-current conversion circuit is integrated in an integrated chip, and the signal output end of the voltage-current conversion circuit forms one pin of the integrated chip. According to the scheme, the voltage-current conversion circuit is integrated in the integrated chip, and only one pin is needed for signal output, so that the cost is reduced.
Therefore, the utility model has the advantages that:
1. the voltage is compared and detected when the comparator is adopted to charge the battery, and the corresponding indicator lamp is controlled to be lightened when the set voltage is reached, so that the electric quantity of the battery can be accurately displayed.
2. The indicator light can flash through the action of the oscillator, so that the circuit can be dynamically displayed when the battery pack is charged.
3. The voltage-current conversion circuit only has one signal output end and only needs to provide one pin for supporting after being integrated into the chip, so that the manufacturing cost of the integrated chip is reduced, and the practical use value is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit structure of a conventional power display circuit in the prior art;
fig. 2 is a schematic diagram of a circuit structure of the present invention;
fig. 3 is a schematic diagram of a second circuit structure of the present invention.
1-voltage current conversion unit 2-electric quantity display unit 3-trigger signal sub-circuit 4-reference sub-circuit 5-display sub-circuit 6-voltage divider sub-circuit 7-comparator.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example 1:
a power display circuit of the present embodiment, as shown in fig. 2, includes a battery B, a voltage-current conversion unit 1 and a power display unit 2. The battery pack is formed by connecting a plurality of batteries B1 … Bn in series, and when the battery pack is charged, the positive pole of the battery pack is connected with a power supply, and the negative pole of the battery pack is grounded. The voltage-current conversion unit 1 comprises a plurality of comparators 7 corresponding to the electric quantity display stage, a plurality of trigger signal sub-circuits 3 and a reference sub-circuit 4 for providing different reference voltages for the comparators. The positive input ends of the comparators are respectively connected to the positive electrode of the battery pack B, and the negative input ends of the comparators are respectively connected to corresponding voltage division points on the reference sub-circuit. And the trigger signal sub-circuits are connected in parallel, one end of the connected circuit is connected with a power supply, the other end of the connected circuit is connected with one end of an oscillator, and the other end of the oscillator is used as a signal output end of the voltage-current conversion unit. Each trigger signal sub-circuit comprises a first control switch for controlling the work of the trigger signal sub-circuit, and the output end of each comparator is respectively connected to the control end of the corresponding first control switch. The electric quantity display unit 2 comprises a plurality of display sub-circuits 5 corresponding to the electric quantity display stage and voltage division sub-circuits 6 providing different control voltages for the display sub-circuits, each display sub-circuit comprises a second control switch controlling the work of the display sub-circuit, the second control switches are respectively connected to corresponding voltage division points on the voltage division sub-circuits, and the signal output end of the voltage-current conversion unit is connected with the input end of the voltage division sub-circuits. In addition, the voltage and current conversion unit is integrated in the integrated chip, the voltage and current conversion unit adopts a signal output end, and only one pin is required to support after integration, so that the voltage and current conversion unit is connected to the electric quantity display unit.
As a specific structure of the circuit display circuit, the circuit display circuit divides the battery charging capacity into n stages for displaying, the voltage-current conversion unit has n comparators 7, n trigger signal sub-circuits 3 corresponding to the comparators, and n display sub-circuits corresponding to the capacity display unit.
As shown in fig. 2, the comparator includes a comparator BG1 … BGn including a positive input terminal, a negative input terminal, and an output terminal.
The reference sub-circuit comprises a reference voltage source E0 and a resistor RE1 … REN corresponding to the electric quantity display grade, wherein the resistor RE1 … REN is connected in series, the circuit is connected to two ends of the reference voltage source E0 after the circuit is connected in series, specifically, the resistor RE1 and the resistor REN are resistors at two ends of the circuit after the circuit is connected in series, one end of the resistor RE1 serves as an input end of the circuit after the circuit is connected in series and is connected with the anode of the reference voltage source, and one end of the resistor REN serves as an output end of the circuit after. The negative electrode of the reference voltage source E0 is connected with the negative electrode end of the battery pack, the inverting input end of the comparator BGk is connected with one end of the resistor REk connected with the positive electrode of the reference voltage source E0, wherein k =1 … n, as shown in FIG. 2, the inverting input end of the comparator BG1 is connected with the connection point between the resistor RE1 and the resistor RE2, the inverting input end of other comparators is connected between the corresponding two resistors in the same way, and the inverting input end of the comparator BGn is connected with the connection point between the resistor REN and the positive electrode of the reference voltage source E0.
The trigger signal sub-circuit comprises a MOS transistor Qk and a resistor RHk, wherein k =1 … n, and the first control switch is the MOS transistor Qk. One end of the resistor RHk is connected to the power supply, the other end of the resistor RHk is connected to the source of the MOS transistor Qk, the drain of the MOS transistor Qk is connected to one end of the oscillator, the other end of the oscillator is connected to the signal output end of the voltage-current conversion unit, and the gate of the MOS transistor Qk is connected to the output end of the comparator BGk. In addition, the resistor RHk in the trigger signal sub-circuit may be replaced with a constant current source IDn.
The voltage dividing sub-circuit comprises a resistor RF1 … RFn corresponding to the electricity quantity display stage, a resistor RF1 … RFn is connected in series, and a point between the two resistors forms a voltage dividing point. One end of the circuit after series connection is used as the input end of the circuit display circuit and is connected with the signal output end of the voltage-current conversion circuit, and the other end of the circuit after series connection is grounded. Specifically, the resistor RF1 and the resistor RFn are resistors at two ends of a series circuit, one end of the resistor RF1 forms an input end of the series circuit, and one end of the resistor RFn forms a ground.
The display sub-circuit comprises a resistor RLk, a light emitting diode LEDk and an MOS tube Gk, wherein k =1 … n, the second control switch is an MOS tube Gk, one end of the resistor RLk is connected with a power supply, the other end of the resistor RLk is connected with the anode of the light emitting diode LEDk, the cathode of the light emitting diode LEDk is connected with the drain of the MOS tube Gk, the source of the MOS tube Gk is grounded, the gate of the MOS tube Gk is connected with one end of the resistor RFk connected with the input end of the circuit display circuit, specifically, as shown in FIG. 2, the gate of the MOS tube G1 is connected with the connection point between the resistor RF1 and the input end of the current display unit, the gate of the MOS tube G2 is connected with the connection point (not shown in the figure) between the resistor RF1 and the resistor RF2, the connection structure is similar, and the gate of.
When the battery pack is charged, the voltage of the positive electrode of the battery pack is increased, when the voltage of the positive input end of the comparator BG1 reaches the voltage value of the reverse input end, the output end of the comparator BG1 outputs high level to the MOS tube Q1, the MOS tube Q1 is conducted, the signal trigger sub-circuit where the signal trigger sub-circuit is located is conducted, a control signal output by the signal trigger sub-circuit passes through the oscillator and then enters the electric quantity display unit, the control signal reaches the grid electrode of the MOS tube Gn through the voltage division sub-circuit in the circuit display unit, the grid electrode voltage of the MOS tube G1 reaches the starting voltage, the MOS tube G1 is conducted, the display sub-circuit where the signal trigger sub-circuit is located is conducted, the light emitting diode LED 1. When the voltage of the positive electrode of the battery pack continues to rise, and then the voltage of the positive input end of the comparator BG2 reaches the voltage of the reverse input end, the light-emitting diode LED2 flashes according to the corresponding steps, and by analogy, the light-emitting diodes LEDn flash one by one in the charging process, and the electric quantity of the rechargeable battery is dynamically displayed.
Example 2:
the present embodiment provides a second power display circuit, as shown in fig. 3, the difference from embodiment 1 lies in that the original oscillator H is eliminated in the voltage-current conversion unit, the trigger signal sub-circuit includes a MOS transistor Qk, a constant current source IDk, and an oscillator Hk, where k =1 … n, the positive electrode of the constant current source IDk is connected to the power supply, the negative electrode of the constant current source IDk is connected to the source electrode of the MOS transistor Qk, the drain electrode of the MOS transistor Qk is connected to the input terminal of the oscillator H, the output terminal of the oscillator Hk is connected to the signal output terminal of the voltage-current conversion unit, the gate electrode of the MOS transistor Qk is connected to the output terminal of the comparator BGk, and the constant. Therefore, an oscillator is added in each trigger signal sub-circuit, when the trigger signal sub-circuits are switched on, the control signals are directly adjusted and output to the signal output end of the voltage-current conversion unit through the oscillators, the same trigger signal sub-circuits are connected in parallel and then connected to the signal output end of the voltage-current conversion unit, and only one signal output end is arranged. The other structure in embodiment 2 is the same as that in embodiment 1.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms such as voltage-to-current conversion unit, power display unit, trigger signal sub-circuit, reference sub-circuit, etc. are used more often herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.
Claims (10)
1. An electric quantity display circuit, characterized in that: the device comprises a battery pack, a voltage-current conversion unit and an electric quantity display unit;
the voltage and current conversion unit comprises a plurality of comparators corresponding to the electric quantity display stage, a plurality of trigger signal sub-circuits and reference sub-circuits for providing different reference voltages for the comparators,
the positive input ends of the comparators are respectively connected with the positive electrode end of the battery pack, the negative input ends of the comparators are respectively connected with the corresponding voltage division points of the reference sub-circuit,
each trigger signal sub-circuit is connected in parallel, one end of the connected circuit is connected with a power supply, the other end of the connected circuit is used as a signal output end of the voltage-current conversion unit, each trigger signal sub-circuit comprises a first control switch for controlling the work of the trigger signal sub-circuit, and the output end of each comparator is respectively connected to the control end of the corresponding first control switch;
the electric quantity display unit comprises a plurality of display sub-circuits corresponding to the electric quantity display stage and a voltage division sub-circuit for providing different control voltages for each display sub-circuit,
each display sub-circuit comprises a second control switch for controlling the work of the display sub-circuit, each second control switch is respectively connected to a corresponding voltage division point of the voltage division sub-circuit, and the signal output end of the voltage-current conversion unit is connected with the input end of the voltage division sub-circuit.
2. The circuit for displaying electric quantity according to claim 1, wherein the comparator comprises a corresponding number of comparators BG1 … BGn according to the set electric quantity display phase.
3. The circuit of claim 2, wherein the reference sub-circuit comprises a reference voltage source E0, a resistor RE1 … REn corresponding to the power display level, the resistor RE1 … REn being connected in series, the series circuit being connected across the reference voltage source E0, the negative terminal of the reference voltage source E0 being connected to the negative terminal of the battery, the inverting input terminal of the comparator BGk being connected to the terminal of the resistor REk connected to the positive terminal of the reference voltage source E0, wherein k =1 … n.
4. The power display circuit of claim 2 or 3, wherein the trigger signal sub-circuit comprises a MOS transistor Qk and a resistor RHk, where k =1 … n, the first control switch is the MOS transistor Qk, one end of the resistor RHk is connected to the power supply, the other end of the resistor RHk is connected to the source of the MOS transistor Qk, the drain of the MOS transistor Qk is connected to the signal output terminal of the voltage-current conversion unit, and the gate of the MOS transistor Qk is connected to the output terminal of the comparator BGk.
5. The power display circuit of claim 2 or 3, wherein the trigger signal sub-circuit comprises a MOS transistor Qk and a constant current source IDk, wherein k =1 … n, the first control switch is a MOS transistor Qk, the positive pole of the constant current source IDk is connected to the power supply, the negative pole of the constant current source IDk is connected to the source of the MOS transistor Qk, the drain of the MOS transistor Qk is connected to the signal output end of the voltage-current conversion unit, and the gate of the MOS transistor Qk is connected to the output end of the comparator BGk.
6. The power display circuit of claim 1, 2 or 3, wherein the voltage divider sub-circuit comprises a resistor RF1 … RFn corresponding to the power display stage, the resistor RF1 … RFn is connected in series, one end of the series circuit is used as the input terminal of the power display unit and is connected to the signal output terminal of the voltage-current conversion unit, and the other end of the series circuit is grounded.
7. The power display circuit of claim 6, wherein the display sub-circuit comprises a resistor RLk, a light emitting diode LEDk, and a MOS transistor Gk, wherein k =1 … n, the second control switch is a MOS transistor Gk, one end of the resistor RLk is connected to a power supply, the other end of the resistor RLk is connected to the anode of the light emitting diode LEDk, the cathode of the light emitting diode LEDk is connected to the drain of the MOS transistor Gk, the source of the MOS transistor Gk is grounded, and the gate of the MOS transistor Gk is connected to one end of the resistor RFk connected to the input terminal of the circuit display circuit.
8. The electric quantity display circuit of claim 4, wherein the electric quantity display unit further comprises an oscillator H, and the oscillator H is connected to the signal output terminal of the voltage-current conversion unit.
9. The electricity quantity display circuit of claim 5, wherein said display sub-circuit further comprises an oscillator Hk, wherein k =1 … n, one end of the oscillator Hk is connected to the drain terminal of the MOS transistor Qk, and the other end of the oscillator Hk is connected to the signal output terminal of the voltage-to-current conversion unit.
10. The power display circuit of claim 1, 2 or 3, wherein the voltage-to-current conversion unit is integrated in an integrated chip, and the signal output terminal of the voltage-to-current conversion unit forms a pin of the integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020563890.8U CN212622958U (en) | 2020-04-15 | 2020-04-15 | Electric quantity display circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020563890.8U CN212622958U (en) | 2020-04-15 | 2020-04-15 | Electric quantity display circuit |
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| CN212622958U true CN212622958U (en) | 2021-02-26 |
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