Power regulation circuits and electronic equipment

Abstract

This utility model relates to a power supply regulation circuit and electronic device. The circuit includes: a signal acquisition module for acquiring electrical signals from a load; a power control module including a power supply unit, a power adjustment transistor, and an operational amplifier unit, wherein a first signal terminal of the power adjustment transistor is connected to the power supply unit, and a second signal terminal is connected to the load; the operational amplifier unit is connected to the controlled terminal of the power adjustment transistor and is used to compare the electrical signals acquired by the signal acquisition module with a reference signal, and output a drive signal to control the power adjustment transistor to operate in the linear region, so that the output signal of the power adjustment transistor is maintained at a target value determined by the reference signal; a protection module including: a differential voltage detection unit connected to the power adjustment transistor for detecting the voltage difference between the first and second signal terminals of the power adjustment transistor; and a power supply regulation unit for adjusting the output voltage of the power supply unit based on the voltage difference output by the differential voltage detection unit. Using this power supply regulation circuit reduces the risk of device damage.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a power regulation circuit and electronic device. Background Technology

[0002] With the rapid development of display panel technology, especially the widespread application of high-resolution liquid crystal displays (LCDs) and organic light-emitting diode (OLED) modules, the precision requirements for the operating voltage of display modules are becoming increasingly stringent. To meet this demand, the display module signal generator needs to output precise voltage and current signals to drive the display module to operate normally.

[0003] In related technologies, feedback compensation mechanisms are typically used to improve the voltage accuracy at the load end (such as display modules). However, this mechanism relies on a fixed upstream power supply voltage design, which can easily lead to device damage when the load current fluctuates significantly. Utility Model Content

[0004] In view of the above, this utility model provides a power regulation circuit and an electronic device to solve at least one problem existing in the background art.

[0005] In a first aspect, embodiments of the present invention provide a power supply regulation circuit, the power supply regulation circuit comprising:

[0006] The signal acquisition module is used to acquire the electrical signals of the load;

[0007] The power control module includes a power supply unit, a power adjustment transistor, and an operational amplifier unit. The first signal terminal of the power adjustment transistor is connected to the power supply unit, and the second signal terminal is connected to the load.

[0008] The operational amplifier unit is connected to the controlled terminal of the power adjustment transistor and is used to compare the electrical signal acquired by the signal acquisition module with a reference signal, and output a drive signal to control the power adjustment transistor to work in the linear region, so that the output signal of the power adjustment transistor is maintained at the target value determined by the reference signal.

[0009] The power regulation circuit further includes a protection module, which includes:

[0010] A differential pressure detection unit is connected to the power adjustment tube and is used to detect the voltage difference between the first signal terminal and the second signal terminal of the power adjustment tube.

[0011] A power supply adjustment unit, connected to the differential pressure detection unit and the power supply unit, is used to adjust the output voltage of the power supply unit based on the voltage difference output by the differential pressure detection unit.

[0012] In some embodiments, the power conditioning unit includes:

[0013] A window comparator, the input of which is connected to the output of the differential pressure detection unit, is used to determine whether the voltage difference detected by the differential pressure detection unit exceeds a preset safety range. When the voltage difference exceeds the safety range, the window comparator outputs a corresponding deviation signal.

[0014] An integrator, connected between the output of the window comparator and the feedback input of the power supply unit, is used to integrate the deviation signal output by the window comparator to generate an adjustable voltage, and output the adjustable voltage to the feedback input of the power supply unit so that the output voltage of the power supply unit is adjusted to the safe range.

[0015] In some embodiments, the differential pressure detection unit includes a first operational amplifier, the non-inverting input of which is connected to the first signal terminal of the power adjustment transistor, and the inverting input of which is connected to the second signal terminal of the power adjustment transistor.

[0016] In some embodiments, the signal acquisition module includes a current acquisition unit; the current acquisition unit is connected in series between the second signal terminal of the power adjustment tube and the load, and is used to acquire the load current and output an acquisition voltage characterizing the load current;

[0017] The operational amplifier unit is used to compare the acquired voltage with the reference voltage and output a drive signal to control the power adjustment transistor to operate in the linear region, so that the output current of the power adjustment transistor is maintained at the target current value determined by the reference voltage.

[0018] In some embodiments, the signal acquisition module includes a current acquisition unit and a voltage acquisition unit;

[0019] The current acquisition unit is connected in series between the second signal terminal of the power adjustment tube and the load, and is used to acquire the load current and output an acquisition voltage characterizing the load current; the voltage acquisition unit is connected to both ends of the load, and is used to acquire the load voltage and output a measurement voltage characterizing the load voltage.

[0020] The power control module further includes a switching unit, which is connected to the voltage acquisition unit, the current acquisition unit and the operational amplifier unit respectively, and is used to selectively output the load voltage or the acquired voltage representing the load current to the operational amplifier unit.

[0021] In some embodiments, the current acquisition unit includes:

[0022] A sampling resistor is connected in series between the second signal terminal of the power regulation transistor and the load to collect the load current;

[0023] A second operational amplifier, the two input terminals of which are respectively connected to the two ends of the sampling resistor, is used to amplify the voltage difference generated by the load current flowing through the sampling resistor;

[0024] An output resistor, connected in series with the output terminal of the second operational amplifier, is used to provide the amplified voltage difference as the sampling voltage to the operational amplifier unit.

[0025] In some embodiments, the voltage acquisition unit includes:

[0026] A third operational amplifier, the two input terminals of which are connected to the load, is used to output the voltage difference between the voltage feedback signal of the load and the ground feedback signal;

[0027] A resistor divider network is connected between the output terminal of the third operational amplifier and the reference ground to divide the voltage output by the third operational amplifier and output the divided voltage as the measured voltage.

[0028] In some embodiments, the switching unit includes a relay or a MOS switch.

[0029] In some embodiments, the power regulation circuit further includes:

[0030] A reference signal source is connected to the operational amplifier unit and is used to output the reference signal to the operational amplifier unit.

[0031] In some embodiments, the power regulating transistor is a P-channel field-effect transistor, with its source connected to the power supply unit, its drain connected to the load, and its gate connected to the output of the operational amplifier unit.

[0032] Secondly, embodiments of the present invention provide an electronic device, the electronic device including the power regulation circuit described in any one of the first aspects.

[0033] This utility model provides a power regulation circuit and electronic device. By setting a signal acquisition module to continuously acquire the electrical signal at the load end, and using an operational amplifier unit in the power control module to compare the electrical signal at the load end with a reference signal, a drive signal is generated to drive the power regulation transistor to operate in the linear region. This ensures that the output signal of the power regulation transistor can be stabilized at the target value determined by the reference signal. Therefore, when applied to screen testing scenarios of display modules, it can meet the high voltage accuracy requirements of the display module. Furthermore, by setting a protection module, the voltage difference detection unit in the protection module continuously monitors the voltage difference between the first signal terminal and the output terminal of the power regulation transistor, and drives the power regulation unit to dynamically adjust the output voltage of the preceding power supply unit based on this voltage difference. This ensures that the voltage difference across the power regulation transistor is maintained within a safe range, reducing the risk of overheating caused by excessive voltage difference due to sudden changes in load current, thereby effectively reducing the possibility of power device damage and improving the reliability of the circuit.

[0034] Additional aspects and advantages of the present 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 present invention. Attached Figure Description

[0035] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, are provided. The drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show details of those features. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0036] Figure 1 A circuit diagram of a power regulation circuit provided in an embodiment of the present invention;

[0037] Figure 2 A circuit diagram of a power regulation unit provided in an embodiment of the present invention;

[0038] Figure 3 A circuit diagram of a power regulation circuit provided in another embodiment of this utility model;

[0039] Figure 4 A circuit diagram of a power regulation circuit provided in another embodiment of this utility model;

[0040] Figure 5 A circuit diagram of a power regulation circuit provided in an embodiment of this utility model. Detailed Implementation

[0041] To make the technical solution and beneficial effects of this utility model more apparent and understandable, the technical solutions in the embodiments of this utility model are clearly and completely described below by listing specific examples. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0043] It is understood that the terms “first,” “second,” etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this invention, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor. When “first” is described, it does not necessarily imply the existence of a “second”; and when “second” is discussed, it does not necessarily imply the existence of a first element, component, region, layer, or portion. As used herein, the singular forms “a,” “an,” and “the” may also be intended to include the plural forms unless the context clearly indicates otherwise. “A plurality” means two or more, unless otherwise explicitly specified. It should also be understood that the term “comprising,” when used in this specification, confirms the presence of the stated feature but does not exclude the presence or addition of one or more other features. As used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0044] It is understood that in the context of this utility model, "connection" means that there is an electrical signal or data transmission between the connected end and the connected end, which can be understood as "electrical connection", "communication connection", etc. In the context of this utility model, "A and B are directly connected" means that there are no other components between A and B except for wires.

[0045] This utility model is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this utility model. In each embodiment of this utility model, unless otherwise specified or logically conflicting, the terminology and / or descriptions are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0046] In related technologies, the display module signal generator needs to output precise voltage and current signals to drive the module to work normally. However, parasitic impedance on the transmission link can cause the load voltage to deviate from the set value, leading to screen abnormalities (such as uneven brightness or color distortion). Therefore, to improve the voltage accuracy at the load end (e.g., the display module), a feedback compensation mechanism is usually adopted. This mechanism can monitor the input voltage of the display module in real time and dynamically adjust the voltage output to the display module to maintain the set value. However, this mechanism relies on a fixed front-end power supply voltage design, which can easily lead to device damage when the current fluctuation of the display module (i.e., the load) is large.

[0047] Figure 1 A circuit diagram of a power regulation circuit according to an embodiment of the present invention is shown. Figure 1 As shown, the power regulation circuit includes a signal acquisition module 110, a power control module 120, and a protection module 130; the power control module 120 includes a power supply unit 121, a power adjustment tube 122, and an operational amplifier unit 123; the protection module 130 includes a differential pressure detection unit 131 and a power regulation unit 132.

[0048] The signal acquisition module 110 is used to acquire the electrical signals of the load 200. The load can be a display module (such as an LCD display module) or other devices that require a stable power supply, such as precision sensors or portable electronic devices.

[0049] The signal acquisition module 110 can convert the acquired electrical signal into a voltage characteristic signal, which is proportional to the actual electrical signal received by the load. This electrical signal can be a voltage signal or a current signal. For example, if the signal acquisition module 110 is used to acquire the voltage signal of the load 200, it can use a precision instrumentation amplifier to measure the voltage difference across the load 200. Its non-inverting and inverting input terminals are directly connected to the two ends of the load 200 through independent feedback lines to eliminate the influence of line losses. As another example, if the signal acquisition module 110 is used to acquire the current signal of the load 200, it can use a sampling resistor in conjunction with a detection amplifier to obtain the current signal by measuring the voltage drop across the sampling resistor connected in series in the load circuit.

[0050] The first signal terminal of the power adjustment transistor 122 is connected to the power supply unit 121, and the second signal terminal is connected to the load 200. The operational amplifier unit 123 is connected to the controlled terminal of the power adjustment transistor 122 and is used to compare the electrical signal acquired by the signal acquisition module 110 with a reference signal, and output a drive signal to control the power adjustment transistor 122 to work in the linear region, so that the output signal of the power adjustment transistor 122 is maintained at the target value determined by the reference signal.

[0051] The first signal terminal of the power regulating transistor 122 is used to receive the voltage signal output by the power supply unit 121, and the second signal terminal of the power regulating transistor 122 is used to output a stable electrical signal after line voltage drop compensation to the load 200.

[0052] The power adjustment transistor 122 can be a field-effect transistor (MOSFET). This MOSFET can be a P-channel field-effect transistor, with its source connected to the power supply unit 121, its drain connected to the load 200, and its gate connected to the output terminal of the operational amplifier unit 123.

[0053] When the power regulator 122 is a P-channel field-effect transistor, the gate voltage of the power regulator 122 is sufficiently negative relative to the source voltage (i.e., V0). GS Less than its turn-on voltage V th V th When the gate voltage is negative, the transistor is turned on; and when the gate voltage approaches the source voltage (i.e., V0), the transistor is turned on. GS When the voltage approaches 0V, the transistor is turned off. The operational amplifier unit 123 can make the P-channel field-effect transistor operate in the linear region (also known as the amplification region or variable resistance region) by precisely controlling the gate voltage, where the drain current and the gate-source voltage are linearly related.

[0054] The power adjustment transistor 122 operates in the linear region and is equivalent to a controlled variable resistor. The operational amplifier unit 123 dynamically adjusts the driving voltage applied to the controlled terminal of the power adjustment transistor 122 based on the comparison result of the acquired electrical signal and a reference signal to achieve reverse adjustment of V. GS This changes the equivalent resistance of the power regulation transistor 122 (i.e., adjusts the conduction level of the power regulation transistor 122 in real time) to compensate for voltage drop changes in the power supply line, thereby stabilizing the voltage or current output to the load 200.

[0055] In other possible implementations, the power regulating transistor 122 may be an insulated gate bipolar transistor (IGBT), with its collector connected to the power supply unit 121, its emitter connected to the load 200, and its gate connected to the output terminal of the operational amplifier unit 123. By precisely controlling the gate voltage of the IGBT, it can be made to operate in the linear region, and stable voltage or current regulation can be achieved by utilizing the characteristic that its on-state voltage drop changes with the gate voltage.

[0056] In some examples, when the signal acquisition module 110 is configured to acquire the voltage signal of the load 200, when the acquired voltage signal is lower than the reference signal, the operational amplifier unit 123 outputs a drive signal to reduce the on-resistance of the power adjustment transistor 122, thereby reducing the voltage drop of the power adjustment transistor 122 (i.e., the voltage difference between the first signal terminal and the second signal terminal of the power adjustment transistor 122) and increasing the load voltage; when the acquired voltage signal is higher than the reference signal, the operational amplifier unit 123 outputs a drive signal to increase the on-resistance of the power adjustment transistor 122, thereby increasing the voltage drop of the power adjustment transistor 122 and reducing the load voltage; when the acquired electrical signal is equal to the reference signal, the power adjustment transistor 122 is driven to maintain its current on-resistance unchanged, thereby maintaining the stability of the electrical signal across the load.

[0057] In some examples, the reference signal can be provided directly by a voltage reference source or can be programmably set via a digital-to-analog converter to provide a precise target reference value for the circuit.

[0058] Maintaining the output signal of the power regulator at a target value determined by a reference signal may include: the output signal of the power regulator approaching the target value set by the reference signal or stabilizing within a preset tolerance range of the target value set by the reference signal.

[0059] The differential pressure detection unit 131 is connected to the power adjustment transistor 122 and is used to detect the voltage difference between the first signal terminal and the second signal terminal of the power adjustment transistor 122. For example, the differential pressure detection unit 131 can be an operational amplifier, with its non-inverting input terminal and inverting input terminal connected to the first signal terminal and the second signal terminal of the power adjustment transistor 122 respectively, to directly measure the voltage difference between the first signal terminal and the second signal terminal of the power adjustment transistor 122, or it can be implemented by using a voltage divider and comparator.

[0060] The power supply regulating unit 132 is connected to the differential pressure detection unit 131 and the power supply unit 121, and is used to adjust the output voltage of the power supply unit 121 based on the voltage difference output by the differential pressure detection unit 131.

[0061] The power supply unit 121 is a DC power supply with adjustable output voltage, such as a switching power supply with a feedback input terminal. The power regulation unit 132 outputs a regulation voltage to act on the feedback input terminal of the power supply unit 121, thereby increasing or decreasing the output voltage of the power supply unit 121. For example, the feedback input terminal of the power supply unit 121 can be an inverting control terminal, and the regulation voltage acting on this feedback input terminal is inversely proportional to the output voltage of the power supply unit 121.

[0062] For example, when the voltage difference output by the differential pressure detection unit 131 exceeds a preset upper limit threshold, the power supply regulating unit 132 reduces the output voltage of the power supply unit 121; when the voltage difference output by the differential pressure detection unit 131 is lower than a preset lower limit threshold, the power supply regulating unit 132 increases the output voltage of the power supply unit 121.

[0063] As an example, the power supply regulating unit 132 can detect whether the voltage difference output by the differential voltage detection unit 131 exceeds a preset safety range (e.g., 0.1V to 0.5V) through a window comparator, and can use an integrator circuit to achieve a smooth voltage regulation process, ensuring that the voltage difference between the first signal terminal and the second signal terminal of the power regulating tube 122 remains within a safe range.

[0064] As another example, the power conditioning unit 132 may be configured to include a voltage comparator and a voltage regulator. The voltage comparator is connected to the differential pressure detection unit and is used to compare the voltage difference output by the differential pressure detection unit with a preset safety range. The voltage regulator is connected between the output terminal of the voltage comparator and the feedback input terminal of the power supply unit 121 and is used to adjust the output voltage of the power supply unit 121 according to the comparison result of the voltage comparator, so as to maintain the voltage difference across the power regulating tube 122 within the preset safety range. For example, when the voltage comparator detects that the voltage difference is greater than the upper limit of the preset safety range, it outputs a first level signal (e.g., a high level signal). The voltage regulator responds to the first level signal output by the voltage comparator and generates a first regulation voltage to the feedback input terminal of the power supply unit 121 to reduce the output voltage of the power supply unit 121, thereby limiting the voltage difference across the power adjustment tube 122 from continuing to increase. When the voltage comparator detects that the voltage difference is less than the lower limit of the preset safety range, the voltage regulator responds to the second level signal output by the voltage comparator (e.g., a low level signal) and generates a second regulation voltage to the feedback input terminal of the power supply unit 121 to increase the output voltage of the power supply unit, thereby preventing insufficient power supply to the downstream load due to the small voltage difference of the power adjustment tube 122.

[0065] It should be noted that when the protection module 130 detects that the voltage difference across the power regulator 122 is too high, for example, the voltage difference across its two ends (such as the V of the MOSFET), the protection module will take action. DSIf the power consumption of the power regulator 122 exceeds a preset safety threshold (e.g., 0.5V), meaning the power consumption of the power regulator 122 is too high, the power supply unit 121 will be adjusted by the power supply adjustment unit 132 to reduce the output voltage of the power supply unit 121. When the output voltage of the power supply unit 121 decreases, the voltage difference across the power regulator 122 will naturally decrease, thereby reducing the power consumption of the power regulator 122 and reducing the possibility of its damage. Furthermore, even with the decrease in the voltage input to the power regulator 122, the entire circuit can still maintain a stable output of voltage or current at the load end by adjusting the conduction level of the power regulator 122.

[0066] In the aforementioned power regulation circuit, a signal acquisition module continuously acquires the electrical signal at the load end, and the operational amplifier unit in the power control module compares the electrical signal at the load end with a reference signal to generate a drive signal to drive the power regulation transistor to operate in the linear region. This ensures that the output signal of the power regulation transistor can be stabilized at the target value determined by the reference signal. Therefore, when applied to the screen testing scenario of the display module, it can meet the high voltage accuracy requirements of the display module. Furthermore, by setting up a protection module, the differential voltage detection unit in the protection module continuously monitors the voltage difference between the first signal terminal and the output terminal of the power regulation transistor, and drives the power regulation unit to dynamically adjust the output voltage of the front-end power supply unit based on the voltage difference. This ensures that the voltage difference across the power regulation transistor is maintained within a safe range, reducing the risk of overheating and excessive power consumption caused by excessive voltage difference across the power regulation transistor due to sudden changes in load current. This effectively reduces the possibility of power device damage and improves the reliability of the circuit.

[0067] In some embodiments, such as Figure 2 As shown, the power regulation unit 132 includes:

[0068] A window comparator 1321 is provided, with its input connected to the output of the differential pressure detection unit. The window comparator is used to determine whether the voltage difference detected by the differential pressure detection unit exceeds a preset safety range. When the voltage difference exceeds the safety range, the window comparator outputs a corresponding deviation signal.

[0069] Integrator 1322 is connected between the output of the window comparator and the feedback input of the power supply unit. It is used to integrate the deviation signal output by the window comparator to generate an adjustment voltage and output the adjustment voltage to the feedback input of the power supply unit so that the output voltage of the power supply unit is adjusted to the safe range.

[0070] In some examples, the integrator may include an operational amplifier, a resistor, and a feedback capacitor connected between the output and inverting input of the operational amplifier, thus forming an integrating circuit. The output voltage of the integrator 1322 is proportional to the integral of the input voltage over time.

[0071] For example, when the voltage difference detected by the differential pressure detection unit (i.e., the voltage difference between the first signal terminal and the second signal terminal of the power adjustment transistor) is higher than the upper limit of the safe range, the window comparator outputs a first deviation signal (i.e., a positive deviation signal). After the first deviation signal is integrated by the integrator, the regulating voltage output by the integrator increases. This increased regulating voltage acts on the feedback input terminal of the power supply unit, causing the output voltage of the power supply unit to decrease, thereby limiting the voltage difference across the power adjustment transistor from continuing to increase and preventing the power adjustment transistor from being damaged due to overvoltage or overheating. When the voltage difference output by the differential pressure detection unit is lower than the lower limit of the safe range, the window comparator outputs a second deviation signal (i.e., a negative deviation signal). After the second deviation signal is integrated by the integrator, the regulating voltage output by the integrator decreases. This decreased regulating voltage acts on the feedback input terminal of the power supply unit, causing the output voltage of the power supply unit to increase, thereby preventing the power adjustment transistor from being affected by insufficient output voltage of the power supply unit due to an excessively small voltage difference, which would affect the normal operation of the downstream load.

[0072] In this embodiment, the window comparator monitors the voltage difference output by the differential pressure detection unit in real time and continuously outputs a corresponding deviation signal to the integrator. The integrator updates the adjustment voltage according to the deviation signal, forming a negative feedback closed-loop control until the voltage difference between the first and second signal terminals of the power adjustment transistor returns to the preset safe range. In the negative feedback loop, the integrator accumulates the deviation signal over time, and its output generates an adjustment voltage that acts on the power supply unit to adjust the output voltage, causing the voltage difference to return towards the safe window. As the adjustment process proceeds, the amplitude of the voltage difference gradually decreases. The adjustment voltage output by the integrator stops changing and locks the current value when the deviation signal disappears, thereby stabilizing the voltage difference across the power adjustment transistor within the safe window and avoiding over-adjustment caused by integral accumulation.

[0073] This achieves smooth and continuous voltage regulation, ensuring that the voltage difference across the power regulator is controlled within a safe range. This effectively protects the power regulator and guarantees the power supply continuity to the downstream load, thereby improving the reliability of the entire circuit operation.

[0074] In some embodiments, the differential pressure detection unit 131 includes a first operational amplifier, the non-inverting input of the first operational amplifier is connected to the first signal terminal of the power adjustment transistor 122, and the inverting input of the first operational amplifier is connected to the second signal terminal of the power adjustment transistor 122.

[0075] In this embodiment, the voltage difference between the two ends of the power adjustment tube 122 is directly measured by the first operational amplifier, providing an accurate differential pressure detection signal to the power supply regulation unit 132. This ensures the accuracy of differential pressure detection and provides a reliable input signal for subsequent power supply regulation.

[0076] In some examples, to improve the accuracy and stability of voltage difference detection, the first operational amplifier is a precision instrumentation amplifier.

[0077] In some examples, to accurately reflect the true voltage difference across the power adjustment transistor 122, the gain factor of the first operational amplifier can be set to 1. In this configuration, when the actual voltage difference between the first and second signal terminals of the power adjustment transistor 122 is 0.5V, the first operational amplifier will output a 0.5V voltage difference detection signal of equal amplitude to the power supply regulating unit 132. This allows the power supply regulating unit 132 to directly and accurately adjust the output voltage of the power supply unit 121 based on the actual voltage difference across the power adjustment transistor 122. For example, when the display module's screen content changes rapidly, causing a sudden change in load current, the voltage difference across the power adjustment transistor 122 will fluctuate accordingly. Thus, using a first operational amplifier with a gain factor of 1, this voltage difference change can be transmitted to the power supply regulating unit 132 in real time and accurately, providing a reliable input signal for the power supply regulating unit 132 to regulate the power supply voltage.

[0078] In some embodiments, such as Figure 3 As shown, the signal acquisition module 110 includes a current acquisition unit 111; the current acquisition unit 111 is connected in series between the second signal terminal of the power adjustment transistor 122 and the load 200, and is used to acquire the load current and output an acquisition voltage characterizing the load current; the operational amplifier unit 123 is used to compare the acquisition voltage with the reference voltage and output a drive signal to control the power adjustment transistor 122 to work in the linear region, so that the output current of the power adjustment transistor 122 is maintained at the target current value determined by the reference voltage.

[0079] In this embodiment, since the current acquisition unit 111 is connected in series in the current path between the second signal terminal (as the output terminal) of the power adjustment transistor 122 and the load 200, the current flowing through the current acquisition unit is the same as the load current (i.e., the current flowing through the load). When the load current flows through the current acquisition unit, it is converted into a corresponding acquisition voltage signal. This acquisition voltage signal is sent to one input terminal of the operational amplifier unit 123, while the reference voltage corresponding to the target current value is connected to the other input terminal of the operational amplifier unit 123. The operational amplifier unit 123 generates a corresponding drive signal by comparing the difference between these two voltage signals to control the conduction degree of the power adjustment transistor 122.

[0080] For example, when the load current increases, causing the sampled voltage to be higher than the reference voltage, the operational amplifier unit 123 outputs a drive signal that reduces the conduction level of the power regulation transistor 122, thereby reducing the output current of the power regulation transistor 122. Conversely, when the load current decreases, causing the sampled voltage to be lower than the reference voltage, the operational amplifier unit 123 outputs a drive signal that increases the conduction level of the power regulation transistor 122, thereby increasing the output current of the power regulation transistor 122. Through this negative feedback regulation mechanism, the circuit can automatically stabilize the output current at a preset target current value, achieving a constant current output function, which is suitable for scenarios requiring precise control of the load current.

[0081] In some embodiments, the current acquisition unit includes a sampling resistor, a second operational amplifier, and an output resistor; the sampling resistor is connected in series between the second signal terminal of the power adjustment transistor 122 and the load 200; the two input terminals of the second operational amplifier are respectively connected to the two ends of the sampling resistor, and are used to amplify the voltage difference generated by the load current flowing through the sampling resistor; the output resistor is connected in series to the output terminal of the second operational amplifier, and is used to provide the amplified voltage difference as the acquisition voltage to the operational amplifier unit 123.

[0082] In some examples, to achieve high-precision current sensing, the sampling resistor features low impedance, high power capacity, and a low temperature drift coefficient. The low impedance minimizes the additional voltage drop and power loss introduced by the sampling resistor itself in the circuit, the high power capacity ensures it can withstand the heat generated when load current flows through it, and the low temperature drift coefficient guarantees consistent sampling accuracy under different ambient temperatures.

[0083] In some examples, the second operational amplifier is a precision instrumentation amplifier capable of amplifying the voltage difference generated by the load current flowing through the sampling resistor. The fixed gain of the second operational amplifier is A times, which can accurately amplify the voltage difference to a voltage range suitable for processing by the operational amplifier unit 123.

[0084] In this embodiment, the load current is proportionally converted into a weak voltage signal (e.g., a millivolt-level voltage signal) by a sampling resistor. The second operational amplifier accurately amplifies this signal. The output resistor not only performs the current limiting function but also matches the input impedance of the subsequent circuit, thereby improving the accuracy and stability of the load current acquisition.

[0085] In some embodiments, such as Figure 4As shown, the signal acquisition module 110 includes a current acquisition unit 111 and a voltage acquisition unit 112. The current acquisition unit 111 is connected in series between the output terminal of the power adjustment tube 122 and the load 200, and is used to acquire the load current and output an acquisition voltage characterizing the load current. The voltage acquisition unit 112 is connected to both ends of the load 200, and is used to acquire the load voltage and output a measurement voltage characterizing the load voltage. The power control module 120 also includes a switching unit 124, which is connected to the voltage acquisition unit 112, the current acquisition unit 111 and the operational amplifier unit 123 respectively, and is used to selectively output the load voltage or the acquisition voltage characterizing the load current to the operational amplifier unit 123.

[0086] The optional implementation of the current acquisition unit 111 can be referred to the relevant descriptions in the foregoing embodiments, and will not be repeated here.

[0087] In this embodiment, when the switching unit 124 connects the load voltage signal output by the voltage acquisition unit 112 to the operational amplifier unit 123, the circuit operates in constant voltage output mode, and the load voltage is stabilized at the target voltage value through negative feedback adjustment; when the switching unit 124 connects the acquisition voltage output by the current acquisition unit 111 to the operational amplifier unit 123, the circuit operates in constant current output mode, and the load current is stabilized at the target current value through negative feedback adjustment.

[0088] The switching unit 124 can receive a mode selection signal from the system main controller or a manual switch to turn on the connection between the current acquisition unit 111 and the operational amplifier unit 123, and disconnect the connection between the voltage acquisition unit 112 and the operational amplifier unit 123; or, turn on the connection between the voltage acquisition unit 112 and the operational amplifier unit 123, and disconnect the connection between the current acquisition unit 111 and the operational amplifier unit 123.

[0089] In some examples, the switching unit 124 includes a relay or a MOSFET. A relay switches the signal path by opening and closing mechanical contacts, offering advantages such as good isolation and low on-resistance. This reduces signal crosstalk and additional voltage drop caused by electronic switches, ensuring the accuracy and reliability of signal transmission in different operating modes. A MOSFET (such as a MOSFET or analog switch chip) utilizes the electric field effect to control the formation and disappearance of a semiconductor channel, achieving switching on and off. It offers advantages such as fast switching speed, small size, no jitter, low power consumption, and convenient control.

[0090] In this embodiment, by setting a switching unit, the power regulation circuit can switch between two operating modes: constant voltage output and constant current output. This improves the applicability and flexibility of the circuit, making it particularly suitable for electronic devices that need to operate in different modes, or for applications that require switching between constant current charging and constant voltage power supply. For example, when constant voltage output is required, the switching unit 124 connects the load voltage signal output by the voltage acquisition unit 112 to the operational amplifier unit 123; when constant current output is required, the switching unit 124 connects the acquired voltage output by the current acquisition unit 111 to the operational amplifier unit 123. Thus, by integrating load voltage acquisition and load current acquisition into the circuit, high-precision detection of load voltage and current can be achieved, improving utilization. Furthermore, by integrating the constant voltage and constant current functions into the same hardware circuit, compared to designing different circuit structures to implement the constant voltage and constant current functions separately, cost and physical space can be saved.

[0091] In some embodiments, the voltage acquisition unit 112 includes a third operational amplifier and a resistor divider network. The two input terminals of the third operational amplifier are connected to the load 200 and are used to output the voltage difference between the voltage feedback signal and the ground feedback signal of the load 200. The resistor divider network is connected between the output terminal of the third operational amplifier and the reference ground and is used to divide the voltage output by the third operational amplifier and output the divided voltage as the measured voltage.

[0092] The third operational amplifier has a gain factor of 1, which is used as a unity-gain buffer. Its two high-impedance input terminals are connected to the two ends of the load 200 respectively, which is used to accurately sense the voltage across the load (i.e., the voltage difference between the load's voltage feedback signal and the ground feedback signal) and provide a low-impedance output.

[0093] For example, the resistor divider network includes a first voltage divider resistor and a second voltage divider resistor connected in series between the output of the third operational amplifier and a reference ground. This divider divides the voltage output by the third operational amplifier, generating a proportionally reduced voltage at the junction of the first and second voltage divider resistors, which serves as a measured voltage characterizing the load voltage. The voltage division is used to match the measured voltage to the input requirements of the operational amplifier unit 123. Here, the first and second voltage divider resistors can be high-precision resistors with low temperature drift to ensure the accuracy and stability of the voltage division ratio.

[0094] In this embodiment, the third operational amplifier accurately measures the actual voltage across the load, while the resistor divider network can be set with a suitable voltage division ratio according to application requirements to adjust the voltage signal output by the operational amplifier to a level range suitable for the operational amplifier unit 123 to process. This ensures the accuracy and applicability of voltage acquisition and also provides a reliable voltage feedback signal for the power control module.

[0095] In some embodiments, the power regulation circuit further includes:

[0096] A reference signal source is connected to the operational amplifier unit and is used to output the reference signal to the operational amplifier unit.

[0097] In some examples, a precision voltage reference chip can be used as the reference signal source to provide a fixed reference voltage with low temperature coefficient and high stability. In other examples, the reference signal source can be implemented by a digital-to-analog converter (DAC). By writing different digital parameters to the DAC through an external controller (such as an MCU), the analog voltage value of its output can be precisely set, allowing the circuit to dynamically adjust the target value of the output voltage or current, thereby improving the flexibility and adaptability of the circuit.

[0098] Next, combine Figure 5 The power regulation circuit provided in the embodiments of this utility model will be further described below.

[0099] See Figure 5 , Figure 5 This is a circuit diagram of a power supply regulation circuit provided for an embodiment of the present invention. The power supply regulation circuit includes a signal acquisition module 110, a power control module 120, and a protection module 130.

[0100] The signal acquisition module 110 includes a current acquisition unit 111 and a voltage acquisition unit 112.

[0101] The current acquisition unit 111 includes a sampling resistor R1, a second operational amplifier OP2, and an output resistor R3. The sampling resistor R1 is connected in series with the load, and the two input terminals of the second operational amplifier OP2 are respectively connected to the two ends of the sampling resistor R1 to amplify the voltage difference generated by the load current flowing through the sampling resistor R1. The output resistor R3 can be used as a current limiting resistor and is connected in series with the output terminal of the second operational amplifier OP2 to output the amplified voltage difference as the acquisition voltage.

[0102] The voltage acquisition unit 112 includes a third operational amplifier OP3, resistors R2 and R6, a first voltage divider resistor R4, and a second voltage divider resistor R5. One end of resistor R2 is connected to the sampling resistor R1 and one end of the load at the Vout node, and the other end of resistor R2 is connected to the non-inverting input of the third operational amplifier OP3. One end of resistor R6 is connected to the inverting input of the third operational amplifier OP3, and the other end of resistor R6 is connected to the reference ground. The first voltage divider resistor R4 and the second voltage divider resistor R5 form a resistor voltage divider network. The third operational amplifier OP3 is used to measure the voltage across the load 200, that is, the voltage difference between the load voltage feedback signal V_FB and the ground feedback signal GND_FB.

[0103] The power control module 120 includes a power supply unit (Power), a MOSFET (as a power adjustment transistor), a fourth operational amplifier OP4, and a relay. The relay, acting as a switching unit, is connected to the output resistor R3 in the current acquisition unit 111, the connection point of the first voltage divider resistor R4 and the second voltage divider resistor R5 in the voltage acquisition unit 112, and the non-inverting input of the fourth operational amplifier OP4. It selectively outputs either a measured voltage representing the load voltage or a sampled voltage representing the load current to the fourth operational amplifier OP4. The inverting input of the fourth operational amplifier OP4 is connected to the output of the digital-to-analog converter DA, and the output of the fourth operational amplifier OP4 is connected to the gate of the MOSFET. It drives the MOSFET to operate in the linear region based on the difference between the signal connected to the relay and the reference signal provided by the digital-to-analog converter DA.

[0104] The protection module 130 includes a first operational amplifier OP1, a window comparator, and an integrator. The first operational amplifier OP1 serves as a differential voltage detection unit, with its two input terminals connected to the source and drain terminals of a MOSFET to detect the voltage difference across the MOSFET. The output terminal of the first operational amplifier OP1 is connected to the window comparator, which compares the voltage difference output by the first operational amplifier OP1 with a preset safety range (e.g., 0.1V to 0.5V). When the voltage difference exceeds the safety range, the window comparator outputs a corresponding deviation signal. The integrator is connected between the output terminal of the window comparator and the input terminal of the power supply unit, and performs integration on the deviation signal output by the window comparator to generate an adjustment voltage to adjust the output voltage of the power supply unit. For example, when the voltage difference exceeds the upper limit of the safety range, the output voltage of the power supply unit is reduced to limit the voltage difference across the power adjustment transistor from exceeding the differential voltage threshold.

[0105] In the power regulation circuit described above, each module works in concert. The current acquisition unit and the voltage acquisition unit feed back the acquired signals to the relay. The relay switches the current or voltage signal to the non-inverting input of the fourth operational amplifier OP4. The fourth operational amplifier OP4 compares the current or voltage signal with a reference signal and outputs a drive signal to control the MOSFET to work in the linear region, thereby adjusting the output current or output voltage of the MOSFET to achieve constant current or constant voltage functions.

[0106] Furthermore, to prevent excessive voltage difference across the MOSFET when it is under load, which could damage the MOSFET and cause the power supply unit's output voltage to directly flow to the output terminal, potentially burning out the load, a protection module detects the voltage difference across the MOSFET and adjusts the power supply unit's output voltage by comparing it with a preset safety threshold. This prevents damage to the power devices. Thus, reliable regulation of the front-end power supply output voltage is achieved, ensuring safe circuit operation.

[0107] In some examples, the first operational amplifier OP1, the second operational amplifier OP2, and the third operational amplifier OP3 mentioned above can be precision instrumentation amplifiers.

[0108] In some examples, the first operational amplifier OP1 has a fixed gain factor of 1 and is used for monitoring the voltage difference across the MOSFET.

[0109] The second operational amplifier OP2 has a fixed gain of A and is used for current-to-voltage signal conversion.

[0110] The third operational amplifier OP3 has a fixed gain of 1 and is used for load voltage detection.

[0111] The fourth operational amplifier, OP4, is a high-voltage operational amplifier used for MOSFET output control.

[0112] In some examples, the MOSFET is a P-channel MOSFET used to control the output voltage and current.

[0113] In some examples, the sampling resistor R1 is a low-impedance, high-power, low-temperature drift current sampling resistor.

[0114] In some examples, resistors R2 and R6 are both high-value resistors (e.g., 2kΩ-10kΩ).

[0115] In some examples, the output resistor R3 is a K-class current-limiting protection resistor (e.g., 1kΩ-10kΩ).

[0116] In some examples, the first voltage divider resistor R4 and the second voltage divider resistor R5 are both precision voltage divider resistors used to divide the output voltage of the third operational amplifier OP3.

[0117] In some embodiments, constant current output is achieved through the cooperation of a power control module and a current acquisition unit.

[0118] Specifically, the second operational amplifier OP2 is used to acquire the voltage difference across the sampling resistor R1. This voltage difference is proportional to the output current of the MOSFET. After being amplified by A times by the second operational amplifier OP2, it is output to the output resistor R3 (which can be used for current limiting protection), converting the current signal into a voltage signal. This voltage signal is connected to the non-inverting input of the fourth operational amplifier OP4. The digital-to-analog converter DA sets the constant current output. Utilizing the characteristics of the fourth operational amplifier OP4, to make the voltages at its inverting input (-) and non-inverting input (+) equal, its output is adjusted to adjust the gate voltage of the MOSFET, controlling the MOSFET to be in the variable resistance region. This adjusts the output current of the MOSFET to the constant current set by DA, thus keeping the current flowing through the sampling resistor constant. The formula for calculating the output current I is: I = V DA / (R1*A), where A is the gain coefficient that can be configured for the second operational amplifier OP2, and V DA The reference signal value is set for the digital-to-analog converter (DA), and R1 represents the resistance value of the sampling resistor R1.

[0119] In some embodiments, constant current output is achieved through the cooperation of the power control module and the voltage acquisition unit.

[0120] The third operational amplifier OP3 samples the load voltage. Through the voltage division by the first and second voltage divider resistors R4 and R5, the remote voltage signal is connected to the non-inverting input of the fourth operational amplifier OP4. The analog-to-digital converter (DA) is set to output a constant voltage. Utilizing the characteristics of the fourth operational amplifier OP4, to ensure that the voltages at its inverting (-) and non-inverting (+) inputs are equal, its output is adjusted. This adjusts the gate voltage of the MOSFET, controlling the MOSFET to operate in the variable resistance region. The output current of the MOSFET is adjusted to the constant voltage set by the DA, thus maintaining a constant load voltage. Resistors R2 and R6 are connected to the non-inverting and inverting inputs of the third operational amplifier OP3, respectively. When no load is connected in the circuit, the output voltage of the MOSFET is fed back from resistors R2 and R6, maintaining a constant output voltage.

[0121] Output voltage V OUT The calculation formula is: V OUT =V DA *(R4+R5) / R5, where V DA The reference signal value is set for the digital-to-analog converter (DA). R4 and R5 represent the resistance values ​​of the first voltage divider resistor R4 and the second voltage divider resistor R5, respectively.

[0122] In some embodiments, the switching between constant current and constant voltage functions is achieved through the cooperation of the power control module with the current acquisition unit and the voltage acquisition unit.

[0123] The current acquisition unit acquires the current signal, and the voltage acquisition unit acquires the voltage signal. The signal is selected and switched to the non-inverting input terminal of the fourth operational amplifier OP4 through a relay, thereby realizing the output of a constant voltage source or a constant current source.

[0124] This utility model embodiment also provides an electronic device, which includes a power regulation circuit as provided in any of the foregoing embodiments.

[0125] This electronic device can provide a stable voltage signal through the constant voltage output mode of the power regulation circuit, or provide a precise current signal through the constant current output mode. Furthermore, through the constant voltage and constant current switching function of the power regulation circuit, it can adapt to the high precision requirements of the load for voltage and current. Moreover, through its built-in protection module, it can effectively prevent the potential damage risk to power devices under the condition of sudden changes in load current.

[0126] In some examples, this electronic device is a testing apparatus for liquid crystal display modules, such as a display module signal generator, used to provide operating voltage or drive current to the display module. Through the constant voltage / constant current switching function of the power regulation circuit, it meets the differentiated voltage and current requirements of the display module at different testing stages. Simultaneously, through the protection function of real-time monitoring of the power regulator voltage difference, it ensures the reliability and safety of the testing process. It is understood that in other application scenarios, this electronic device can also be a battery testing device, etc.

[0127] In this embodiment, the electronic device, through its built-in power regulation circuit, can provide high-precision power supply control while ensuring the reliability and safety of power regulation, making it suitable for various test and measurement instruments and equipment that require precise power management.

[0128] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0129] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A power supply regulating circuit, characterized by, The power regulation circuit includes: The signal acquisition module is used to acquire the electrical signals of the load; The power control module includes a power supply unit, a power adjustment transistor, and an operational amplifier unit. The first signal terminal of the power adjustment transistor is connected to the power supply unit, and the second signal terminal is connected to the load. The operational amplifier unit is connected to the controlled terminal of the power adjustment transistor and is used to compare the electrical signal acquired by the signal acquisition module with a reference signal, and output a drive signal to control the power adjustment transistor to work in the linear region, so that the output signal of the power adjustment transistor is maintained at the target value determined by the reference signal. The power regulation circuit further includes a protection module, which includes: A differential pressure detection unit is connected to the power adjustment tube and is used to detect the voltage difference between the first signal terminal and the second signal terminal of the power adjustment tube. A power supply adjustment unit, connected to the differential pressure detection unit and the power supply unit, is used to adjust the output voltage of the power supply unit based on the voltage difference output by the differential pressure detection unit.

2. The power supply regulation circuit of claim 1, wherein, The power conditioning unit includes: A window comparator, the input of which is connected to the output of the differential pressure detection unit, is used to determine whether the voltage difference detected by the differential pressure detection unit exceeds a preset safety range. When the voltage difference exceeds the safety range, the window comparator outputs a corresponding deviation signal. An integrator, connected between the output of the window comparator and the feedback input of the power supply unit, is used to integrate the deviation signal output by the window comparator to generate an adjustable voltage, and output the adjustable voltage to the feedback input of the power supply unit so that the output voltage of the power supply unit is adjusted to the safe range.

3. The power supply regulation circuit of claim 1, wherein, The differential pressure detection unit includes a first operational amplifier, the non-inverting input of which is connected to the first signal terminal of the power adjustment transistor, and the inverting input of which is connected to the second signal terminal of the power adjustment transistor.

4. The power supply regulation circuit of claim 1, wherein, The signal acquisition module includes a current acquisition unit; the current acquisition unit is connected in series between the second signal terminal of the power adjustment tube and the load, and is used to acquire the load current and output an acquisition voltage characterizing the load current; The operational amplifier unit is used to compare the acquired voltage with the reference voltage and output a drive signal to control the power adjustment transistor to operate in the linear region, so that the output current of the power adjustment transistor is maintained at the target current value determined by the reference voltage.

5. The power supply regulation circuit of claim 1, wherein, The signal acquisition module includes a current acquisition unit and a voltage acquisition unit; The current acquisition unit is connected in series between the second signal terminal of the power adjustment tube and the load, and is used to acquire the load current and output an acquisition voltage characterizing the load current; the voltage acquisition unit is connected to both ends of the load, and is used to acquire the load voltage and output a measurement voltage characterizing the load voltage. The power control module further includes a switching unit, which is connected to the voltage acquisition unit, the current acquisition unit and the operational amplifier unit respectively, and is used to selectively output the load voltage or the acquired voltage representing the load current to the operational amplifier unit.

6. A power supply regulation circuit according to claim 4 or 5, characterised in that, The current acquisition unit includes: A sampling resistor is connected in series between the second signal terminal of the power regulation transistor and the load to collect the load current; A second operational amplifier, the two input terminals of which are respectively connected to the two ends of the sampling resistor, is used to amplify the voltage difference generated by the load current flowing through the sampling resistor; An output resistor, connected in series with the output terminal of the second operational amplifier, is used to provide the amplified voltage difference as the sampling voltage to the operational amplifier unit.

7. The power supply regulation circuit of claim 5, wherein, The voltage acquisition unit includes: A third operational amplifier, the two input terminals of which are connected to the load, is used to output the voltage difference between the voltage feedback signal of the load and the ground feedback signal; A resistor divider network is connected between the output terminal of the third operational amplifier and the reference ground to divide the voltage output by the third operational amplifier and output the divided voltage as the measured voltage.

8. The power supply regulation circuit of claim 5, wherein, The switching unit includes a relay or a MOS switch.

9. The power supply regulating circuit according to any one of claims 1 to 5, characterized in that, The power regulation circuit also includes: A reference signal source is connected to the operational amplifier unit and is used to output the reference signal to the operational amplifier unit.

10. The power supply regulating circuit according to any one of claims 1 to 5, characterized in that, The power regulation transistor is a P-channel field-effect transistor. The source of the P-channel field-effect transistor is connected to the power supply unit, the drain is connected to the load, and the gate is connected to the output terminal of the operational amplifier unit.

11. An electronic device, characterized in that, The electronic device includes the power regulation circuit according to any one of claims 1 to 10.

Images