CN117707278B - Reference voltage generating circuit and parallel voltage reference chip - Google Patents
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Abstract
The invention discloses a reference voltage generating circuit and a parallel voltage reference chip, wherein the reference voltage generating circuit comprises: the constant current source sub-circuit, the positive pole of the constant current source sub-circuit is used for connecting the input voltage, the negative pole of the constant current source sub-circuit is used for connecting the external load, and the constant current source sub-circuit is configured to provide constant target current according to the input voltage; the first end of the reference sub-circuit is connected with the negative electrode of the constant current source sub-circuit, and the second end of the reference sub-circuit is grounded; and the current control sub-circuit is respectively connected with the negative electrode of the constant current source sub-circuit and the third end of the reference sub-circuit and is configured to adjust the current of the reference sub-circuit according to the target reference voltage so as to provide the required reference voltage for an external load. The invention changes the external resistance of the parallel voltage reference chip into the constant current source so as to realize smaller current, power consumption and heating of the parallel voltage reference chip under the condition of changing the input voltage, and omits relatively complicated resistance value calculation and selection.
Description
Technical Field
The invention relates to the technical field of integrated chips, in particular to a reference voltage generating circuit and a parallel voltage reference chip.
Background
Voltage reference circuits have important applications in many electronics. For example, in the automotive and industrial fields, it is desirable to be able to generate a reference voltage with a certain accuracy for use by a module such as an ADC (Analog-to-Digital Converter).
In the related art, an external resistor is arranged outside the parallel voltage reference chip, the resistance value of the external resistor is selected and related to the input voltage, the current range born by the load and the working current of the parallel voltage reference chip, and the external resistor is calculated according to the parameters, so that the external resistor is complicated to calculate.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a reference voltage generating circuit and a parallel voltage reference chip, which change the external resistance of the parallel voltage reference chip into a constant current source to realize smaller current, power consumption and heat generation of the parallel voltage reference chip under the condition of input voltage variation, and omit relatively complicated resistance value calculation and selection.
To achieve the above object, an embodiment of a first aspect of the present invention provides a reference voltage generating circuit, including: a constant current source sub-circuit, the positive pole of the constant current source sub-circuit being used for connecting an input voltage, the negative pole of the constant current source sub-circuit being used for connecting an external load, the constant current source sub-circuit being configured to provide a constant target current according to the input voltage, wherein the target current is greater than or equal to the sum of the maximum allowable current of the external load and the minimum quiescent current of a reference sub-circuit; the first end of the reference sub-circuit is connected with the negative electrode of the constant current source sub-circuit, and the second end of the reference sub-circuit is grounded; and the current control sub-circuit is respectively connected with the negative electrode of the constant current source sub-circuit and the third end of the reference sub-circuit and is configured to adjust the current of the reference sub-circuit according to the target reference voltage so as to provide the required reference voltage for the external load.
In addition, the reference voltage generating circuit according to the above embodiment of the present invention may further have the following additional technical features:
According to one embodiment of the invention, the constant current source sub-circuit comprises a first diode, a first transistor and a first resistor, wherein the anode of the first diode is used as the positive electrode of the constant current source sub-circuit, the cathode of the first diode is connected with the drain electrode of the first transistor, the source electrode of the first transistor is connected with the first end of the first resistor, and the second end of the first resistor is connected with the grid electrode of the first transistor and used as the negative electrode of the constant current source sub-circuit.
According to one embodiment of the invention, the constant current source sub-circuit further comprises a high withstand voltage semiconductor unit.
According to one embodiment of the invention, the reference sub-circuit comprises a second resistor and a third resistor, wherein a first end of the second resistor is used as a first end of the reference sub-circuit, a second end of the second resistor is connected with a first end of the third resistor, and a second end of the third resistor is grounded.
According to one embodiment of the invention, the current control sub-circuit comprises an operational amplifier, wherein a positive power end of the operational amplifier is connected with a negative electrode of the constant current source sub-circuit, a negative power end of the operational amplifier is grounded, a same-direction input end of the operational amplifier is connected with a third end of the reference sub-circuit, a reverse input end of the operational amplifier is connected with a positive electrode of a preset power supply, and a negative electrode of the preset power supply is grounded.
According to one embodiment of the present invention, the current control sub-circuit further includes a first triode, a base electrode of the first triode is connected to an output end of the operational amplifier, an emitter electrode of the first triode is connected to a negative power supply end of the operational amplifier and is grounded, and a collector electrode of the first triode is connected to a positive power supply end of the operational amplifier.
According to one embodiment of the present invention, the current control sub-circuit further includes a second diode, a cathode of the second diode is connected to a collector of the first triode, and an anode of the second diode is connected to an emitter of the first triode.
According to one embodiment of the invention, the first end of the reference sub-circuit is used as an output end of the reference voltage generating circuit, and is used for outputting the reference voltage, and the output end of the reference voltage generating circuit is externally connected with a load.
The reference voltage generating circuit comprises a constant current source sub-circuit, a reference sub-circuit and a current control sub-circuit, wherein the positive electrode of the constant current source sub-circuit is used for being connected with an input voltage, the negative electrode of the constant current source sub-circuit is used for being connected with an external load, the constant current source sub-circuit provides constant target current according to the input voltage and provides the target current for the external load and the reference sub-circuit, the first end of the reference sub-circuit is connected with the negative electrode of the constant current source sub-circuit, the second end of the reference sub-circuit is grounded, the current control sub-circuit is respectively connected with the negative electrode of the constant current source sub-circuit and the reference sub-circuit, and current of the reference sub-circuit is adjusted according to the target reference voltage so as to provide required reference voltage for the external load. The invention changes the external resistance of the parallel voltage reference chip into the constant current source so as to realize smaller current, power consumption and heating of the parallel voltage reference chip under the condition of changing the input voltage, and omits relatively complicated resistance value calculation and selection.
In order to achieve the above objective, a second aspect of the present invention provides a parallel voltage reference chip, where the chip is integrated by the above reference voltage generating circuit, the chip includes a constant current source sub-circuit and a current control sub-circuit, the chip is a three-terminal chip, the positive electrode of the constant current source sub-circuit is used as a first input terminal of the chip, the third terminal of the reference sub-circuit is used as a second input terminal of the chip, and the output terminal of the chip is connected to an external load.
To achieve the above objective, an embodiment of a third aspect of the present invention provides a parallel voltage reference chip, where the chip includes the integration of the reference voltage generating circuit, the chip includes a current control sub-circuit, the chip is a three-terminal chip, a negative electrode of the constant current source sub-circuit is used as a first input terminal of the chip, a third terminal of the reference sub-circuit is used as a second input terminal of the chip, and an output terminal of the chip is connected to an external load.
The parallel voltage reference chip is integrated by the reference voltage generating circuit, and the external resistor of the parallel voltage reference chip is changed into a constant current source, so that the parallel voltage reference chip has smaller current, power consumption and heat under the condition of changing input voltage, and relatively complicated resistance value calculation and selection are omitted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic diagram of a series voltage reference circuit/chip of an external resistor in accordance with one embodiment of the invention;
FIG. 2 is a schematic diagram of an external resistive parallel voltage reference circuit/chip in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a reference voltage generation circuit according to one embodiment of the invention;
FIG. 4 is a schematic diagram of a constant current source subcircuit of one embodiment of the present invention;
FIG. 5 is a schematic diagram of a reference sub-circuit and a current control sub-circuit of one embodiment of the present invention;
FIG. 6 is a schematic diagram of a parallel voltage reference chip of an internal constant current source according to one embodiment of the invention;
fig. 7 is a schematic diagram of a parallel voltage reference chip of an external constant current source according to one embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
Reference voltage generating circuits and parallel voltage reference chips according to embodiments of the present invention will be described in detail below with reference to the accompanying drawings and detailed description.
The voltage reference circuit can be divided into a series voltage reference circuit and a parallel voltage reference circuit, and the main characteristics of the two circuits are as follows: 1) The series voltage reference is a three-port device and the parallel voltage reference is a two-port device. 2) The parallel voltage reference may be configured as a special circuit, such as a negative reference voltage generating circuit, etc. 3) The series voltage reference may be considered a resistance control type and the parallel voltage reference may be considered a current control type (like a zener diode). 4) The series voltage reference input voltage range has an upper limit, and the parallel voltage reference input voltage range is selected according to a suitable external resistor, and theoretically has no upper limit. 5) If no load is present, the series voltage reference only consumes the quiescent current of the chip itself, and the parallel voltage reference will flow through the voltage reference chip itself if no load is present since the entire circuit input will always provide the maximum current. 6) The series voltage reference has a greater chip operating quiescent current relative to the parallel voltage reference. 7) The resistor connected in series with the voltage reference is arranged in the chip, and the power consumption and the heating of the resistor are needed to be born by the chip; the resistor connected with the voltage reference in parallel is arranged outside the chip, and the power consumption and the heat generation of the resistor do not need to be born by the chip. 8) The initial accuracy and temperature coefficient of the series voltage reference will generally be better than the parallel voltage reference. 9) Selection and design of a reference circuit: the series voltage reference is relatively simple, and only the input voltage and the power need to be considered within the rated range of the chip; the parallel voltage reference is relatively cumbersome and requires calculation of the minimum and maximum values allowed by the external resistance. Fig. 1 shows an embodiment of a series voltage reference circuit and fig. 2 shows an embodiment of a parallel voltage reference circuit.
For a parallel voltage reference circuit, the choice of the value of the external resistance (Rs in fig. 2) needs to follow:
1) At minimum input voltage and maximum load current, rs should be less than rs_max (the maximum value of Rs) to ensure proper operation of the parallel voltage reference chip.
2) In the case of maximum input voltage and minimum load current, rs should be greater than rs_min (minimum value of Rs) to prevent the operating current from exceeding the maximum value of the parallel voltage reference chip.
3) Rs_max needs to be greater than rs_min, with the resistance value of Rs selected between rs_max and rs_min.
4) Within the range allowed by rs_min and rs_max, a larger Rs resistance value selection means lower power consumption.
For example, some application requires a reference voltage of 2.5V to be generated. The input voltage range of the system is 12V-48V, the current range of the load is 0.1mA-1mA, the minimum working current of the parallel voltage reference is 60uA, and the maximum working current is 15mA. Then rs_max and rs_min are calculated as follows:
Problems of the prior art:
Problem 1: there is a range of input voltages for the parallel voltage reference circuit, such as a drop in battery voltage, or a drift in power supply, etc. As the vin_min considered is smaller, the value of rs_max will become smaller, resulting in a smaller maximum value of the selectable external resistor R1, and a larger current on R1 (see the following formula), resulting in a greater power consumption of the parallel voltage reference circuit as a whole.
Next, the additional added overall power consumption is illustrated in the application case in two automobiles:
Example 1:
A 12V battery powered system requires the generation of a reference voltage of 5V. The input voltage range of the system is 8V-17V, the current range of the load is 0.1mA-1mA, the minimum working current of the parallel voltage reference is 60uA, and the maximum working current is 15mA. Then rs_max and rs_min are calculated as follows:
if only 12V is considered to be its lowest operating voltage (i.e., consider the most ideal case, lowest operating voltage = normal operating voltage), then rs_max is calculated as:
it can be seen that, in order to consider the lowest operating voltage of 8V, the ratio of the consumption currents is:
that is, assuming that the external resistances are all rs_max, the parallel reference circuit normally operating at 12V consumes 133% of the current in order to cover the minimum voltage of 8V.
Example 2:
A 48V battery powered system requires the generation of a 12V reference voltage. The input voltage range of the system is 24V-54V (refer to LV148 standard), the current range of the load is 0.1mA-1mA, the minimum working current of the parallel voltage reference is 60uA, and the maximum working current is 15mA. Then rs_max and rs_min are calculated as follows:
if only 48V is considered to be its lowest operating voltage (i.e., consider the most ideal case, lowest operating voltage = normal operating voltage), then rs_max is calculated as:
it can be seen that, in order to consider the lowest operating voltage of 24V, the ratio of the consumption currents is:
That is, assuming that the external resistances are all rs_max, the parallel reference circuit normally operating at 48V consumes 200% of the current in order to cover the lowest voltage 24V.
Also, in different systems, it is necessary to consider different rs_max and select an appropriate external resistance value, which is itself relatively cumbersome.
The present invention proposes a solution to replace Rs with a nonlinear resistor, so that when the input VIN changes, the value of Rs also changes, which is equal to the value when VIN at that time is taken as the imaginary vin_min, so that the whole parallel reference circuit can consume smaller current dynamically:
The current through Rs (where Rs is R1 in the original scheme, representing the resistance in series in the circuit) is:
It can be seen that making the constant current source current equal to the IRS in the above figure, or slightly greater than IRS (taking into account some threshold space) a smaller current/power consumption/heating of the parallel reference circuit can be achieved. Alternatively, the constant current source provides a current that is the sum of the maximum load current and the minimum quiescent current of the shunt reference, so that the shunt reference can operate normally when the load consumes maximum current. Compared with the condition that the original resistor is outside the parallel reference, the circuit does not consume extra current due to external input voltage fluctuation, so that low power consumption of voltage range self-adaption is realized.
The invention provides a reference voltage generating circuit, which is characterized in that an external resistor is replaced by a constant current source to realize smaller current, power consumption and heat generation of a parallel voltage reference circuit under the condition of changing input voltage. Because no external resistor is used, relatively cumbersome resistor value calculation and selection is omitted.
Fig. 3 is a schematic diagram of a reference voltage generation circuit according to one embodiment of the invention.
In one embodiment of the present invention, as shown in fig. 3, the reference voltage generation circuit 100 includes: a constant current source sub-circuit 10, wherein the positive electrode of the constant current source sub-circuit 10 is used for connecting an input voltage, the negative electrode of the constant current source sub-circuit 10 is used for connecting an external load, the constant current source sub-circuit 10 is configured to provide a constant target current according to the input voltage, and the target current is larger than or equal to the sum of the maximum allowable current of the external load and the minimum quiescent current of the reference sub-circuit; a reference sub-circuit 20, a first end of the reference sub-circuit 20 is connected with the negative electrode of the constant current source sub-circuit 10, and a second end of the reference sub-circuit 20 is grounded; the current control sub-circuit 30 is connected to the negative electrode of the constant current source sub-circuit 10 and the third terminal of the reference sub-circuit 20, respectively, and is configured to adjust the current of the reference sub-circuit 20 according to the target reference voltage, and to provide the external load with a desired reference voltage.
Specifically, the reference voltage generating circuit 100 includes a constant current source sub-circuit 10, a reference sub-circuit 20, and a current control sub-circuit 30, where the positive electrode of the constant current source sub-circuit 10 receives an input voltage, the input voltage is within a certain range, the negative electrode of the constant current source sub-circuit 10 is respectively connected to the reference sub-circuit 20, the current control sub-circuit 30, and a load, the input voltage provides the constant current source sub-circuit 10 with a voltage, the constant current source sub-circuit 10 generates a constant target current, the target current needs to be provided for the load to ensure that the load works normally, and the target current also needs to ensure that the reference sub-circuit 20 can work normally, so the target current is greater than or equal to the sum of the maximum allowable current of the external load and the minimum quiescent current of the reference sub-circuit.
More specifically, the first terminal of the reference sub-circuit 20 is connected to the negative electrode of the constant current source sub-circuit 10, the second terminal of the reference sub-circuit 20 is grounded, the third terminal of the reference sub-circuit 20 is connected to the current control sub-circuit 30, the first terminal of the current control sub-circuit 30 is connected to the negative electrode of the constant current source sub-circuit 10, the second terminal of the current control sub-circuit 30 is connected to the third terminal of the reference sub-circuit 20, and the third terminal of the current control sub-circuit 30 is grounded. The current control sub-circuit 30 adjusts the current of the reference sub-circuit 20 according to the target reference voltage to provide the desired reference voltage for the external load.
The constant current source sub-circuit 10 may be realized by a high withstand voltage semiconductor constant current source circuit or by an external constant current diode.
In one embodiment of the present invention, as shown in fig. 4, the constant current source sub-circuit 10 includes a first diode D1, a first transistor T1 and a first resistor R1, wherein an anode of the first diode D1 serves as a positive electrode of the constant current source sub-circuit 10, a cathode of the first diode D1 is connected to a drain of the first transistor T1, a source of the first transistor T1 is connected to a first end of the first resistor R1, and a second end of the first resistor R1 is connected to a gate of the first transistor T1 and serves as a negative electrode of the constant current source sub-circuit 10.
Specifically, the constant current source sub-circuit 10 may be implemented by an external constant current diode, and as one example, the constant current source sub-circuit 10 may be constituted by one diode, one transistor, and one resistor. The constant current source sub-circuit 10 may include a first diode D1, a first transistor T1 and a first resistor R1, and an anode of the first diode D1 is used as a positive electrode of the constant current source sub-circuit 10 to be connected to an input voltage. The first transistor T1 may be an n-channel JFET transistor. The drain electrode of the first transistor T1 is connected to the cathode of the first diode D1, the source electrode of the first transistor T1 is connected to the first end of the first resistor R1, the gate electrode of the first transistor T1 is connected to the second end of the first resistor R1, and the gate electrode of the first transistor T1 and the second end of the first resistor R1 serve as the cathode of the constant current source sub-circuit 10.
Compared with the condition that the original resistor is outside the parallel reference, the external resistor is replaced by the constant current source sub-circuit, the circuit does not consume extra current additionally due to external input voltage fluctuation, so that the self-adaptive low power consumption of the voltage range is realized, and relatively complicated resistance value calculation and selection are omitted.
The constant current source sub-circuit 10 may be realized by a high withstand voltage semiconductor constant current source circuit in addition to an external constant current diode.
In one embodiment of the invention, the constant current source subcircuit further comprises a high withstand voltage semiconductor unit.
In one embodiment of the present invention, the reference sub-circuit 20 includes a second resistor R2 and a third resistor R3, wherein a first end of the second resistor R2 is used as a first end of the reference sub-circuit 20, a second end of the second resistor R2 is connected to a first end of the third resistor R3, and a second end of the third resistor R3 is grounded.
Specifically, the reference sub-circuit 20 includes two resistors, namely, a second resistor R2 and a third resistor R3, respectively, where the second resistor R2 and the third resistor R3 are connected in series, a first end of the second resistor R2 is used as a first end of the reference sub-circuit 20 to connect with the negative electrode of the constant current source sub-circuit 10, a second end of the third resistor R3 is used as a second end of the reference sub-circuit 20 to be grounded, and a middle of the second resistor R2 and the third resistor R3 is used as a third end of the reference sub-circuit 20 to be connected with the current control sub-circuit 30 and to provide a reference voltage for the current control sub-circuit 30.
In one embodiment of the present invention, the current control sub-circuit 30 includes an operational amplifier, wherein the positive power terminal of the operational amplifier is connected to the negative electrode of the constant current source sub-circuit 10, the negative power terminal of the operational amplifier is grounded, the unidirectional input terminal of the operational amplifier is connected to the third terminal of the reference sub-circuit, the reverse input terminal of the operational amplifier is connected to the positive electrode of the preset power supply, and the negative electrode of the preset power supply is grounded.
Specifically, the current control sub-circuit 30 includes an operational amplifier, the positive power supply of the operational amplifier is connected to the negative pole of the constant current source sub-circuit 10, the constant current source sub-circuit 10 supplies power to the operational amplifier so that the operational amplifier works normally, the negative power supply of the operational amplifier is connected to the ground, the same-direction input end of the operational amplifier is connected to the third end of the reference sub-circuit 20, that is, the reference sub-circuit 20 provides reference voltage to the same-direction input end of the operational amplifier, the reverse input end of the operational amplifier is connected to the preset power supply, and the preset power supply can be preconfigured. The output end of the operational amplifier is connected with a triode.
In one embodiment of the present invention, as shown in fig. 5, the current control sub-circuit 30 further includes a first triode Q1, wherein a base electrode of the first triode Q1 is connected to an output terminal of the operational amplifier, an emitter electrode of the first triode Q1 is connected to a negative power supply terminal of the operational amplifier and is grounded, and a collector electrode of the first triode Q1 is connected to a positive power supply terminal of the operational amplifier.
Specifically, the output end of the operational amplifier is connected with the base electrode of the first triode Q1, the emitter electrode of the first triode Q1 is connected with the negative power supply end of the operational amplifier and grounded, the collector electrode of the first triode Q1 is connected with the positive power supply end of the operational amplifier, and the first triode Q1 is conducted under the drive of the operational amplifier.
In one embodiment of the present invention, as shown in fig. 5, the current control sub-circuit 30 further includes a second diode D2, wherein a cathode of the second diode D2 is connected to a collector of the first transistor Q1, and an anode of the second diode D2 is connected to an emitter of the first transistor Q1.
Specifically, the second diode D2 is connected in parallel to the emitter and collector of the first triode Q1, the anode of the second diode D2 is connected to the emitter of the first triode Q1, and the cathode of the second diode D2 is connected to the collector of the first triode Q1. The second diode D2 functions as a freewheel.
In one embodiment of the present invention, the first end of the reference sub-circuit 20 is used as an output end of the reference voltage generating circuit, and is used for outputting a reference voltage, and the output end of the reference voltage generating circuit is externally connected with a load.
Specifically, the first end of the reference sub-circuit 20, that is, the output end of the negative electrode reference voltage generating circuit of the constant current source sub-circuit 10, is used for outputting a reference voltage, and the output end of the reference voltage generating circuit 100 is externally connected with a load L, and the other end of the load L is grounded for providing a reference voltage required by the load.
It should be noted that, in the reference voltage generating circuit according to the embodiment of the present invention, no limitation is imposed on the upper limit of the input voltage in the selection of the external voltage input, because unlike a resistor, an internal constant current source circuit or an external constant current diode generally has a voltage withstand requirement. For specific applications, the input voltage cannot be limited, and only the improved parallel reference circuit or the parallel reference chip model with proper parameters are selected according to the input voltage range and the maximum load current.
The reference voltage generating circuit comprises a constant current source sub-circuit, a reference sub-circuit and a current control sub-circuit, wherein the positive electrode of the constant current source sub-circuit is used for being connected with an input voltage, the negative electrode of the constant current source sub-circuit is used for being connected with an external load, the constant current source sub-circuit provides constant target current according to the input voltage and provides the target current for the external load and the reference sub-circuit, the first end of the reference sub-circuit is connected with the negative electrode of the constant current source sub-circuit, the second end of the reference sub-circuit is grounded, the current control sub-circuit is respectively connected with the negative electrode of the constant current source sub-circuit and the reference sub-circuit, and current of the reference sub-circuit is adjusted according to the target reference voltage so as to provide required reference voltage for the external load. The invention changes the external resistance of the parallel voltage reference chip into the constant current source so as to realize smaller current, power consumption and heating of the parallel voltage reference chip under the condition of changing the input voltage, and omits relatively complicated resistance value calculation and selection.
The reference voltage generating circuit according to the above embodiment is manufactured as a parallel voltage reference chip, and the manufactured parallel voltage reference chip may have the constant current source built inside the parallel voltage reference chip or may have the constant current source placed outside.
The invention also provides a parallel voltage reference chip.
In one embodiment of the present invention, as shown in fig. 6, the parallel voltage reference chip 200 is integrated by the reference voltage generating circuit 100, the parallel voltage reference chip 200 includes the constant current source sub-circuit 10 and the current control sub-circuit 30, the chip 200 is a three-terminal chip, the positive electrode of the constant current source sub-circuit 10 is used as the first input terminal of the chip 200, the third terminal of the reference sub-circuit 20 is used as the second input terminal of the chip 200, and the output terminal of the chip 200 is connected to an external load.
The invention also provides a parallel voltage reference chip.
In one embodiment of the present invention, as shown in fig. 7, the parallel voltage reference chip 200 includes the reference voltage generating circuit 100 integrated as described above, the chip 200 includes the current control sub-circuit 30, the chip 200 is a three-terminal chip, the negative electrode of the constant current source sub-circuit 10 is used as the first input terminal of the chip 200, the third terminal of the reference sub-circuit 20 is used as the second input terminal of the chip 200, and the output terminal of the chip 200 is connected to an external load.
The parallel voltage reference chip is integrated by the reference voltage generating circuit, and the external resistor of the parallel voltage reference chip is changed into a constant current source, so that the parallel voltage reference chip has smaller current, power consumption and heat under the condition of changing input voltage, and relatively complicated resistance value calculation and selection are omitted.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A reference voltage generation circuit, the circuit comprising:
A constant current source sub-circuit, the positive pole of the constant current source sub-circuit being used for connecting an input voltage, the negative pole of the constant current source sub-circuit being used for connecting an external load, the constant current source sub-circuit being configured to provide a constant target current according to the input voltage, wherein the target current is greater than or equal to the sum of the maximum allowable current of the external load and the minimum quiescent current of a reference sub-circuit;
The first end of the reference sub-circuit is connected with the negative electrode of the constant current source sub-circuit, and the second end of the reference sub-circuit is grounded;
and the current control sub-circuit is respectively connected with the negative electrode of the constant current source sub-circuit and the third end of the reference sub-circuit and is configured to adjust the current of the reference sub-circuit according to the target reference voltage so as to provide the required reference voltage for the external load.
2. The reference voltage generating circuit according to claim 1, wherein the constant current source sub-circuit includes a first diode, a first transistor, and a first resistor, an anode of the first diode is used as an anode of the constant current source sub-circuit, a cathode of the first diode is connected to a drain of the first transistor, a source of the first transistor is connected to a first end of the first resistor, and a second end of the first resistor is connected to a gate of the first transistor and is used as a cathode of the constant current source sub-circuit.
3. The reference voltage generating circuit according to claim 1, wherein the constant current source sub-circuit further comprises a high withstand voltage semiconductor unit.
4. The reference voltage generating circuit of claim 1, wherein the reference sub-circuit comprises a second resistor and a third resistor, a first end of the second resistor being a first end of the reference sub-circuit, a second end of the second resistor being connected to a first end of the third resistor, a second end of the third resistor being grounded.
5. The reference voltage generating circuit according to claim 1, wherein the current control sub-circuit comprises an operational amplifier, a positive power supply terminal of the operational amplifier is connected to a negative electrode of the constant current source sub-circuit, a negative power supply terminal of the operational amplifier is grounded, a homodromous input terminal of the operational amplifier is connected to a third terminal of the reference sub-circuit, a reverse input terminal of the operational amplifier is connected to a positive electrode of a preset power supply, and a negative electrode of the preset power supply is grounded.
6. The reference voltage generating circuit according to claim 5, wherein the current control sub-circuit further comprises a first triode, a base electrode of the first triode is connected to the output end of the operational amplifier, an emitter electrode of the first triode is connected to the negative power supply end of the operational amplifier and is grounded, and a collector electrode of the first triode is connected to the positive power supply end of the operational amplifier.
7. The reference voltage generating circuit of claim 6, wherein the current control subcircuit further comprises a second diode, a cathode of the second diode being connected to a collector of the first transistor, an anode of the second diode being connected to an emitter of the first transistor.
8. The reference voltage generating circuit of claim 1, wherein the first terminal of the reference sub-circuit is an output terminal of the reference voltage generating circuit for outputting the reference voltage, the output terminal of the reference voltage generating circuit being externally connected to a load.
9. A parallel voltage reference chip, characterized in that the chip is integrated by a reference voltage generating circuit according to any of claims 1-8, the chip comprising a constant current source sub-circuit and a current control sub-circuit, the chip being a three terminal chip, the positive pole of the constant current source sub-circuit being the first input of the chip, the third terminal of the reference sub-circuit being the second input of the chip, the output of the chip being connected to an external load.
10. A parallel voltage reference chip, characterized in that the chip comprises a current control sub-circuit integrated by a reference voltage generating circuit according to any of claims 1-8, the chip being a three-terminal chip, the negative pole of the constant current source sub-circuit being the first input of the chip, the third terminal of the reference sub-circuit being the second input of the chip, the output of the chip being connected to an external load.
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| CN202410140331.9A CN117707278B (en) | 2024-02-01 | 2024-02-01 | Reference voltage generating circuit and parallel voltage reference chip |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410140331.9A CN117707278B (en) | 2024-02-01 | 2024-02-01 | Reference voltage generating circuit and parallel voltage reference chip |
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| CN117707278B true CN117707278B (en) | 2024-05-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573638A (en) * | 2003-06-19 | 2005-02-02 | 罗姆股份有限公司 | Constant voltage generator and electronic equipment using the same |
| JP2008059541A (en) * | 2006-08-30 | 2008-03-13 | Seiko Npc Corp | Constant voltage circuit |
| CN104460798A (en) * | 2014-10-28 | 2015-03-25 | 美科微半导体（上海）有限公司 | Method and application of reference voltage correcting circuit for controlling buck converter |
| CN206378762U (en) * | 2016-12-20 | 2017-08-04 | 安徽英发电子有限公司 | A kind of reference voltage sample circuit controlled for constant-current source |
| CN218471196U (en) * | 2022-09-08 | 2023-02-10 | 广州金升阳科技有限公司 | Reference circuit |
-
2024
- 2024-02-01 CN CN202410140331.9A patent/CN117707278B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1573638A (en) * | 2003-06-19 | 2005-02-02 | 罗姆股份有限公司 | Constant voltage generator and electronic equipment using the same |
| JP2008059541A (en) * | 2006-08-30 | 2008-03-13 | Seiko Npc Corp | Constant voltage circuit |
| CN104460798A (en) * | 2014-10-28 | 2015-03-25 | 美科微半导体（上海）有限公司 | Method and application of reference voltage correcting circuit for controlling buck converter |
| CN206378762U (en) * | 2016-12-20 | 2017-08-04 | 安徽英发电子有限公司 | A kind of reference voltage sample circuit controlled for constant-current source |
| CN218471196U (en) * | 2022-09-08 | 2023-02-10 | 广州金升阳科技有限公司 | Reference circuit |
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| CN117707278A (en) | 2024-03-15 |
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