CN116208129A - High-voltage comparator circuit - Google Patents

High-voltage comparator circuit Download PDF

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Publication number
CN116208129A
CN116208129A CN202111454261.7A CN202111454261A CN116208129A CN 116208129 A CN116208129 A CN 116208129A CN 202111454261 A CN202111454261 A CN 202111454261A CN 116208129 A CN116208129 A CN 116208129A
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China
Prior art keywords
voltage
comparator
voltage comparator
feedforward
output
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CN202111454261.7A
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Chinese (zh)
Inventor
池宏韬
张利地
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SG Micro Beijing Co Ltd
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SG Micro Beijing Co Ltd
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Priority to CN202111454261.7A priority Critical patent/CN116208129A/en
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
    • H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
    • H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
    • H03K5/2472—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude using field effect transistors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Manipulation Of Pulses (AREA)

Abstract

A high voltage comparator circuit, characterized by: the circuit comprises a high-voltage comparator, a feedforward comparator, a logic unit, a power tube and a pull-up resistor; the positive phase input end and the negative phase input end of the high-voltage comparator are respectively connected with the positive phase input end and the negative phase input end of the feedforward comparator so as to realize synchronous receiving and comparing of high voltage; the input end of the logic unit is connected with the output end of the high-voltage comparator and is used for receiving the output result of the high-voltage comparator and sending a judging result NG1 to the grid electrode of the power tube N1 after logic judgment is completed; the output end of the feedforward comparator is connected with the grid electrode of the power tube N1 so as to realize feedforward control of the power tube N1; the drain electrode of the power tube N1 is connected to the power supply voltage through a pull-up resistor, and meanwhile, the drain electrode of the power tube N1 is used as the output end of the high-voltage comparator circuit, and the source electrode of the power tube N1 is grounded. The method is simple, low in power and high in speed.

Description

High-voltage comparator circuit
Technical Field
The present invention relates to the field of integrated circuits, and more particularly to a high voltage comparator circuit.
Background
At present, the high-voltage comparator circuit is widely applied to various intelligent devices, relays, circuit breakers, sensors and battery-powered products due to a very wide voltage comparison range. In general, the high voltage comparator may include a high precision comparator, logic unit, and open drain input for implementing the brown-out detection.
The output of the circuit is driven low when the voltage difference between the positive and negative inputs of the comparator falls below a negative threshold, and is driven high when the voltage difference between the positive and negative inputs of the comparator rises above a positive threshold. By adding built-in hysteresis for suppressing noise in the comparator, stable output operation of the circuit can be ensured, and false triggering cannot be caused.
However, since the high-voltage comparator is generally used in the case of a higher power supply voltage, when the power supply voltage is used to supply power to all the components in the comparator circuit, the power consumption in the circuit will be greatly reduced, so that the temperature of the circuit will be raised faster, and the energy consumption will be high.
In addition, when a built-in delay is added to the comparator, the output speed of the comparator is greatly reduced. This results in a larger delay in the input signal to the logic unit and the power transistors than the settling time of the supply voltage. This delay causes an untimely establishment of a stable operating state of the logic unit and the power transistor, and further causes an output voltage of the high voltage comparator circuit to be difficult to establish an effective output for a long period of time after the power supply voltage is powered up.
In order to solve the problem, the invention provides a novel high-voltage comparison circuit.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a high-voltage comparison circuit, which reduces the area of a second stage of a high-voltage comparator and the power consumption of part of logic devices by adopting low voltage to supply power to the second stage of the high-voltage comparator and the logic units, and does not need to add additional elements. In addition, the invention also improves the quick response capability of the circuit by adding the feedforward comparator.
The invention adopts the following technical scheme.
The high-voltage comparator circuit comprises a high-voltage comparator, a feedforward comparator, a logic unit, a power tube and a pull-up resistor; the positive phase input end and the negative phase input end of the high-voltage comparator are respectively connected with the positive phase input end and the negative phase input end of the feedforward comparator so as to realize synchronous receiving and comparing of high voltage; the input end of the logic unit is connected with the output end of the high-voltage comparator, and is used for receiving the output result of the high-voltage comparator and sending the judging result NG1 to the grid electrode of the power tube N1 after logic judgment is completed; the output end of the feedforward comparator is connected with the grid electrode of the power tube N1 so as to realize feedforward control of the power tube N1; the drain electrode of the power tube N1 is connected to the power supply voltage through a pull-up resistor, and meanwhile, the drain electrode of the power tube N1 is used as the output end of the high-voltage comparator circuit, and the source electrode of the power tube N1 is grounded.
Preferably, the high-voltage comparator is of a two-stage operational amplifier structure; and the device voltage end of the logic unit and the voltage end of the second-stage operational amplifier in the high-voltage comparator are respectively connected with the reference voltage V2.
Preferably, the input and output signals of the logic cells are inverted.
Preferably, when the output voltage of the feedforward comparator is at a high level, the stable duration of the circuit output signal is determined based on the output duration of the feedforward comparator and the state switching duration of the power transistor N1.
Preferably, when the output voltage of the feedforward comparator is low, the circuit output signal is established in synchronization with the power supply voltage.
Preferably, the area of the MOS transistor in the high-voltage comparator is larger than that in the feedforward comparator.
Preferably, the area of the MOS tube of the first-stage operational amplifier in the high-voltage comparator is larger than that of the MOS tube of the second-stage operational amplifier.
Compared with the prior art, the high-voltage comparison circuit has the advantages that the logic units in the circuit can be driven by adopting the two-stage input voltage of the comparator, so that the power consumption of part of logic devices is reduced, and additional elements are not required to be added. In addition, the invention also improves the quick response capability of the circuit by adding the feedforward comparator.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of a high voltage comparator circuit according to the present invention;
FIG. 2 is a schematic diagram of a second embodiment of a high voltage comparator circuit according to the present invention;
FIG. 3 is a schematic diagram showing the variation of the output voltage with time of a first embodiment of a high voltage comparator circuit according to the present invention;
fig. 4 is a schematic diagram showing the output voltage variation with time of a second embodiment of the high voltage comparator circuit according to the present invention.
Detailed Description
The present application is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present invention and are not intended to limit the scope of protection of the present application.
Fig. 1 is a schematic diagram of a first embodiment of a high voltage comparator circuit according to the present invention. As shown in fig. 1, a high voltage comparator circuit, wherein the circuit comprises a high voltage comparator, a logic unit, a power tube and a pull-up resistor; the input end of the logic unit is connected with the output end of the high-voltage comparator, and is used for receiving the output result of the high-voltage comparator and sending the judging result NG1 to the grid electrode of the power tube N1 after logic judgment is completed; the drain electrode of the power tube N1 is connected to the power supply voltage through a pull-up resistor, and meanwhile, the drain electrode of the power tube N1 is used as the output end of the high-voltage comparator circuit, and the source electrode of the power tube N1 is grounded.
It can be understood that in the present invention, the high voltage comparator compares the voltages received by the positive phase input terminal and the negative phase input terminal thereof, and outputs the voltage difference to the logic unit, and the logic unit determines the magnitude of the voltage difference to select to output a high level or a low level. The power tube receives the high level or the low level and then correspondingly realizes the on or off state. When the power tube is in an on state, the on resistance of the power tube is far greater than the pull-up resistor, the output voltage is lower, the voltage division of the on resistance and the pull-up resistor of the power tube is achieved, and when the power tube is in an off state, the pull-up resistor is far greater than the off resistance of the power tube, the output voltage is higher, and the voltage division of the pull-up resistor and the off resistance of the power tube is achieved.
In the invention, in order to make the logic unit consume the energy provided by the power supply voltage as little as possible and reduce the energy consumption ratio of the logic unit in the whole circuit as much as possible, the temperature rise caused by energy consumption is reduced, and a lower working voltage is provided for the logic unit. In the prior art, in order to provide low voltage for a part of devices in a chip, resistor voltage division, a reference voltage generation module and the like are generally adopted for implementation, and the mode is complex, and the resistor voltage division still cannot reduce power consumption. In order to solve the above problem, the second stage voltages of the device voltage terminals V2 and I1 of the logic cell are terminated together in the present invention. By applying a reference voltage with lower amplitude to the point in the circuit, the reference voltage can supply low-voltage power for the second stage of the logic unit and the high-voltage comparator, so that normal operation of the high-voltage comparator and the logic unit is ensured, and the overall power consumption of the circuit is lower.
Preferably, the high-voltage comparator is of a two-stage operational amplifier structure; and the device voltage end of the logic unit is connected with the voltage end of the second-stage operational amplifier in the high-voltage comparator.
The high voltage comparator of the present invention selects a two-stage comparator in order to increase the gain. With the prior art method, more stages of comparators may be used.
Fig. 2 is a schematic diagram of a second embodiment of a high voltage comparator circuit according to the present invention. In the present invention, as shown in fig. 2, a feedforward comparator is added to the circuit in order to prevent the establishment of the output signal of the high-voltage comparator from being too slow. The two input ends of the comparator synchronously receive voltage signals to be compared with the high-voltage comparator, and output signals are output to the grid electrode of the power tube.
Preferably, the circuit comprises a high-voltage comparator, a feedforward comparator, a logic unit, a power tube and a pull-up resistor; the positive phase input end and the negative phase input end of the high-voltage comparator are respectively connected with the positive phase input end and the negative phase input end of the feedforward comparator so as to realize synchronous receiving and comparing of high voltage; the input end of the logic unit is connected with the output end of the high-voltage comparator, and is used for receiving the output result of the high-voltage comparator and sending the judging result NG1 to the grid electrode of the power tube N1 after logic judgment is completed; the output end of the feedforward comparator is connected with the grid electrode of the power tube N1 so as to realize feedforward control of the power tube N1; the drain electrode of the power tube N1 is connected to the power supply voltage through a pull-up resistor, and meanwhile, the drain electrode of the power tube N1 is used as the output end of the high-voltage comparator circuit, and the source electrode of the power tube N1 is grounded.
It should be noted that, since the comparator mainly acts as a feedforward signal, and does not perform very accurate comparison on the voltage, the comparator does not need to adopt a multi-stage comparator structure, and does not need to intentionally increase the area of a tube to reduce offset voltage or increase capacitance to improve stability. The feedforward comparator can adopt the simplest basic differential pair as far as possible to realize the preliminary comparison of the input voltage and the output of the approximate result.
Comparing the two different embodiments of the present invention, it can be found that the circuit configuration employing the feedforward comparator can provide more rapid stabilization of the output voltage.
Fig. 3 is a schematic diagram showing the output voltage variation with time of a first embodiment of a high voltage comparator circuit according to the present invention. Fig. 3 includes four status diagrams (a), (b), (c), and (d). Specifically, (a) is a schematic diagram of the change of the output voltage signal of each element with time under the condition that the power supply voltage is rapidly powered up when the voltage difference between the positive phase input terminal and the negative phase input terminal of the high-voltage comparator is smaller than zero. Meanwhile, (b) is the condition that the voltage difference between the positive phase input end and the negative phase input end of the high-voltage comparator is smaller than zero, and the power voltage is electrified at a low speed. (c) Similar to (a) and (b), but with the voltage difference between the positive and negative phase inputs of the high voltage comparator being greater than zero.
As can be seen from fig. 3 (a), when the power supply voltage Vdd is rapidly powered up, V2 is established after the power supply voltage is established, and the logic unit establishes an operating state and outputs a NG1 signal to instruct the power transistor N1 to enter the operating state as V2 is established.
It can be seen that the output signal cannot be in a certain state for a period of time after the power supply voltage starts to build up and before the power tube builds up a stable operating state. The time period comprises a time period from the establishment of the power supply voltage to the establishment of the V2 voltage, and also comprises a time period from the establishment of the first-stage output voltage of the operational amplifier to the stabilization of the output voltage of the logic unit, and a time period from the stabilization of the output voltage of the logic unit to the stabilization of the state of the MOS tube N1.
As can be seen from fig. 3 (b), the supply voltage may also be affected by other parts of the overall circuit, resulting in a slower power-up process for the supply voltage. If the power supply voltage is powered up slowly, the high voltage comparator may sequentially establish the primary output voltage and the secondary output voltage during the power supply voltage power up process. However, the circuit still provides the control voltage for the MOS transistor N1 after the logic unit output is stable, and realizes the stability of the output voltage after the output of the MOS transistor N1 is stable.
When the difference between the positive phase input terminal voltage and the negative phase input terminal voltage of the comparator of the two circuits in (a) and (b) is smaller than zero, the output of the high-voltage comparator is at a low level, and the logic unit generates a reverse high-level signal according to the low-level signal at the moment, and controls the conduction of N1, so that the output voltage Vout is basically about 0V. In this process, the logic unit outputs a high level to stable conduction of N1, so that the state of the output voltage cannot be guaranteed to be unique, and after N1 is stably conducted, the output voltage can be guaranteed to reach a stable state again.
When the difference between the voltage of the positive phase input end and the voltage of the negative phase input end of the comparator of the two circuits in the (c) and the (d) is larger than zero, the output of the high-voltage comparator is high level, the logic unit generates a low-level signal, and after the logic unit is stabilized in the level signal, the signal can be in a stable state, the power tube is cut off, and the output voltage is high.
Fig. 4 is a schematic diagram showing the output voltage variation with time of a second embodiment of the high voltage comparator circuit according to the present invention. Fig. 4 also includes four status diagrams (a), (b), (c), and (d). Similar to what is shown in fig. 3, the four states represent the difference in voltage at the positive and negative inputs of the circuit, and the difference in power supply voltage set-up time, respectively.
For fig. 4 (a) and (b), after the power supply voltage is powered up, the feedforward comparator quickly receives the positive phase input voltage and the negative phase input voltage, thereby obtaining an output voltage and outputting it directly to NG1 in the circuit. It should be noted that the logic units in the present invention should have a relationship of signal inversion before and after each other. That is, when the input signal is high or low, the output signal should be low or high, respectively. Therefore, the MOS tube N1 can be guaranteed to receive control signals with the same phase.
Preferably, when the output voltage of the feedforward comparator is at a high level, the stable duration of the circuit output signal is determined based on the output duration of the feedforward comparator and the state switching duration of the power transistor N1. It can be seen that no matter how long the voltage V2 is established, the output voltage is quickly stabilized according to the establishment of NG1 and Vdd, and the drift of the voltage signal in an uncertain state is eliminated.
In fig. 4 (c) and (d), the output signal of the circuit remains substantially completely synchronized with the set-up of the supply voltage, since the output of the comparator is high. That is, when the output voltage of the feedforward comparator is low level, the circuit output signal is established in synchronization with the power supply voltage.
Preferably, the area of the MOS transistor in the high-voltage comparator is larger than that in the feedforward comparator. Generally, the area of the MOS transistor in the high-voltage comparator is far greater than that of the MOS transistor in the feedforward comparator, so that the response speed of the feedforward comparator is fast enough compared with that of the high-voltage comparator.
Preferably, the area of the MOS tube of the first-stage operational amplifier in the high-voltage comparator is larger than that of the MOS tube of the second-stage operational amplifier. Generally, in order to make the input offset voltage of the high voltage comparator small enough, the size of the input end MOS transistor is relatively large, and therefore, if the high voltage comparator is divided into a first stage and a second stage, the size of the transistor in the first stage is required to have a large size. The second stage of tubing does not have this requirement.
Compared with the prior art, the high-voltage comparison circuit has the beneficial effect that the feedforward comparator is added, so that the quick response capability of the circuit is improved.
While the applicant has described and illustrated the embodiments of the present invention in detail with reference to the drawings, it should be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not to limit the scope of the present invention, but any improvements or modifications based on the spirit of the present invention should fall within the scope of the present invention.

Claims (7)

1. A high voltage comparator circuit, characterized by:
the circuit comprises a high-voltage comparator, a feedforward comparator, a logic unit, a power tube and a pull-up resistor; wherein,,
the positive phase input end and the negative phase input end of the high-voltage comparator are respectively connected with the positive phase input end and the negative phase input end of the feedforward comparator so as to realize synchronous receiving and comparing of high voltage;
the input end of the logic unit is connected with the output end of the high-voltage comparator and is used for receiving the output result of the high-voltage comparator and sending a judging result NG1 to the grid electrode of the power tube N1 after logic judgment is completed;
the output end of the feedforward comparator is connected with the grid electrode of the power tube N1 so as to realize feedforward control of the power tube N1;
the drain electrode of the power tube N1 is connected to the power supply voltage through a pull-up resistor, and meanwhile, the drain electrode of the power tube N1 is used as the output end of the high-voltage comparator circuit, and the source electrode of the power tube N1 is grounded.
2. A high voltage comparator circuit according to claim 1, wherein:
the high-voltage comparator is of a two-stage operational amplifier structure; and, in addition, the processing unit,
and the device voltage end of the logic unit and the voltage end of the second-stage operational amplifier in the high-voltage comparator are respectively connected with the reference voltage V2.
3. A high voltage comparator circuit according to claim 2, wherein:
the input and output signals of the logic unit are inverted.
4. A high voltage comparator circuit according to claim 3, wherein:
when the output voltage of the feedforward comparator is at a high level, the stable duration of the circuit output signal is determined based on the output duration of the feedforward comparator and the state switching duration of the power tube N1.
5. A high voltage comparator circuit according to claim 4, wherein:
when the output voltage of the feedforward comparator is low level, the circuit output signal is established in synchronization with the power supply voltage.
6. A high voltage comparator circuit according to claim 5, wherein:
the area of the MOS tube in the high-voltage comparator is larger than that in the feedforward comparator.
7. A high voltage comparator circuit according to claim 6, wherein:
and the area of the MOS tube of the first-stage operational amplifier in the high-voltage comparator is larger than that of the MOS tube of the second-stage operational amplifier.
CN202111454261.7A 2021-12-01 2021-12-01 High-voltage comparator circuit Pending CN116208129A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111454261.7A CN116208129A (en) 2021-12-01 2021-12-01 High-voltage comparator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111454261.7A CN116208129A (en) 2021-12-01 2021-12-01 High-voltage comparator circuit

Publications (1)

Publication Number Publication Date
CN116208129A true CN116208129A (en) 2023-06-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111454261.7A Pending CN116208129A (en) 2021-12-01 2021-12-01 High-voltage comparator circuit

Country Status (1)

Country Link
CN (1) CN116208129A (en)

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