CN218850626U - Voltage follower circuit, power module and electronic equipment - Google Patents
Voltage follower circuit, power module and electronic equipment Download PDFInfo
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Abstract
The utility model relates to a voltage follower circuit, a power supply module and an electronic device, wherein the voltage follower circuit comprises a power supply input end, a power supply output end, a voltage stabilizing module, a boosting module and a voltage follower module; the voltage following module comprises a first signal end, a second signal end and a signal feedback end; a first signal end of the voltage following module is connected with an output end of the boosting module, a second signal end of the voltage following module is connected with a first output end of the voltage stabilizing module, and a signal feedback end of the voltage following module is connected with a voltage regulating end of the voltage stabilizing module; the voltage following module is used for generating a feedback signal and transmitting the feedback signal to the voltage regulating end of the voltage stabilizing module through the signal feedback end when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, and the voltage of the first output end of the voltage stabilizing module is increased by touching.
Description
Technical Field
The utility model relates to a power supply circuit technical field especially relates to a voltage follower circuit, power module and electronic equipment.
Background
In a backlight power circuit of a display device such as a smart television or an interactive flat panel, an output power with a voltage value and a current value adapted to each other is generally obtained in a step-by-step processing manner to drive a load light string to light. In the related circuit, a Power Factor Correction (PFC) circuit can be connected to a mains supply to obtain an alternating current Power supply, the PFC circuit outputs a rectified and boosted direct current Power supply to a constant voltage unit, a constant voltage source is output to a booster circuit after being processed by the constant voltage unit, the booster circuit boosts the constant voltage source and outputs an adaptive Power supply under the regulation and control of a pulse modulation signal, and therefore the load lamp string is driven to be lightened.
In the process of testing the display device, the specification and the size of the display device are different, the number of the load lamp strings is also different, and the voltage values of the required driving power supply are different. Because the adaptive voltage fluctuation range of the load lamp string is large, when the driving voltage of the load lamp string is large, the boosting ratio of the booster circuit is increased accordingly, the loss on the booster circuit is increased greatly, devices in the booster circuit need to adopt high-specification elements to realize high boosting ratio, and the circuit realization cost is high.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides a voltage follower circuit, power module and electronic equipment, voltage follower circuit can be when the driving voltage of power consumption load is higher, feed back the signal of telecommunication to front end voltage stabilizing module to make voltage stabilizing module's output voltage increase, thereby help reducing the boost ratio of rear end voltage stabilizing module, make voltage stabilizing module adopt conventional components and parts to realize, the cost is lower.
According to a first aspect of the present invention, there is provided a voltage follower circuit, comprising a power input terminal, a power output terminal, a voltage stabilizing module, a boosting module and a voltage follower module;
the power supply input end is used for being connected with an external power supply to obtain the external power supply, and the power supply output end is used for being connected with a rear-end electric load to provide a power supply;
the voltage stabilizing module is provided with a first input end, a first output end and a voltage regulating end, the first input end is connected with the power supply input end, and the first output end is connected with the input end of the boosting module;
the output end of the boosting module is connected with the output end of the power supply;
the voltage following module comprises a first signal end, a second signal end and a signal feedback end; the first signal end of the voltage following module is connected with the output end of the boosting module, the second signal end of the voltage following module is connected with the first output end of the voltage stabilizing module, and the signal feedback end of the voltage following module is connected with the voltage regulating end of the voltage stabilizing module;
the voltage following module is used for generating a feedback signal and transmitting the feedback signal to the voltage regulating end of the voltage stabilizing module through the signal feedback end when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, and the voltage of the first output end of the voltage stabilizing module is increased by touching.
According to a second aspect of the present invention, there is provided a power module including the voltage follower circuit as described in the above embodiments.
According to a third aspect of the present invention, there is provided an electronic device, comprising an electric load and a power module as described in the above embodiment, wherein the electric load is connected to a power output end of the power module.
The utility model discloses a technical scheme of above-mentioned embodiment, through set up voltage follower circuit between the first output and the first input at the module that steps up, when the magnitude of voltage of the first output of the module that steps up exceeds the magnitude of voltage of first input and predetermines the magnitude of voltage, the module that steps up of the module that steps up is than when higher promptly, first output has the electric current to flow through voltage follower module, voltage follower module just can be to the front end voltage stabilizing module feedback signal of telecommunication, and make voltage stabilizing module's output voltage increase, thereby help reducing the boost ratio of rear end voltage stabilizing module, make the module that steps up adopt conventional components and parts to realize, the cost is lower.
For better understanding and implementation, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic block diagram of a voltage follower circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a connection between a voltage follower circuit and a voltage regulator module according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a boost module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present invention are shown in the drawings.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In the following, several specific embodiments are given for describing the technical solution of the present application in detail. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
The utility model provides a voltage follower circuit, power module and electronic equipment, voltage follower circuit can be when the drive voltage of power consumption load is higher, to front end circuit feedback signal of telecommunication to make voltage stabilizing module's output voltage increase, thereby help reducing the boost ratio of rear end boost module, make the boost module adopt conventional components and parts to realize that the cost is lower.
Referring to fig. 1, fig. 1 is a schematic block diagram of a voltage follower circuit according to an embodiment of the present invention.
In this embodiment, the voltage follower circuit includes a power input terminal VIN, a power output terminal VOUT, a voltage stabilizing module 10, a voltage boosting module 20, and a voltage follower module 30.
The power input end VIN is used for being connected with an external power supply to obtain the external power supply, and the power output end VOUT is used for being connected with a rear-end power load circuit to provide a power supply, wherein the voltage value of the power output by the power output end VOUT can be larger than the voltage value of the power input end receiving the power supply.
The voltage stabilizing module 10 is configured to output a power supply with a relatively constant voltage value, where the voltage stabilizing module 10 has a first input end 101, a first output end 102, and a voltage regulating end 103, the first input end 101 is connected to the power supply input end VIN, and the first output end 102 is connected to the input end 201 of the voltage boosting module 20.
The boosting module 20 is configured to boost the output voltage of the voltage stabilizing module 10 to a preset value, so as to meet the electric quantity demand of the rear-end electric load. The output end 202 of the boost module 20 is connected to the power output end VOUT, and can provide power with a voltage value adapted to the back-end electric load.
The voltage following module 30 comprises a first signal terminal 301, a second signal terminal 302 and a signal feedback terminal 303; the first signal terminal 301 of the voltage follower module 30 is connected to the output terminal 202 of the boost module 20, the second signal terminal 302 thereof is connected to the first output terminal 102 of the regulator module 10, and the signal feedback terminal 303 thereof is connected to the voltage regulation terminal 103 of the regulator module 10, so as to feed back a signal to the regulator module 10.
The voltage following module 30 is configured to generate a feedback signal and transmit the feedback signal to the voltage regulation terminal 103 of the voltage regulation module 10 through the signal feedback terminal 303 when a voltage difference between the first signal terminal 101 and the second signal terminal 102 is greater than a preset voltage value, so as to increase the voltage of the first output terminal 102 of the voltage regulation module 10.
The utility model discloses a voltage follower circuit of above-mentioned embodiment, through set up voltage follower circuit 30 between the first output 202 and the first input 201 at boost module 20, when the magnitude of voltage of the first output 202 of boost module 20 exceeds the magnitude of voltage of first input 201 and predetermines the magnitude of voltage, boost module 20's boost ratio is higher promptly, first output 202 has the electric current to flow through voltage follower module 30, voltage follower module 30 is just to front end voltage stabilizing module 10 feedback signal, voltage follower module 30 and front end voltage stabilizing module 10 under the combined action with the first output 102 of voltage stabilizing module 10 voltage-regulated, boost module 20's boost ratio can reduce. Therefore, the boost module 20 can be realized by only using conventional components without using components with larger specifications, which helps to reduce the cost of the whole power module.
The following describes the voltage follower circuit in detail with reference to the schematic circuit diagram.
Referring to fig. 2, fig. 2 is a schematic diagram illustrating a connection between a voltage follower circuit and a voltage regulator module according to an embodiment of the present invention.
The voltage stabilizing module 10 includes a first voltage stabilizing unit 11 and a first voltage dividing unit 12, an output terminal of the first voltage stabilizing unit 11 is connected to the first output terminal VBL through the first voltage dividing unit 11, and the first voltage dividing unit 12 has the voltage regulating terminal. The voltage following module 30 includes a second voltage dividing unit 31, a first end of the second voltage dividing unit 31 is connected to the voltage regulating end, and a second end thereof is connected to the reference level end. The reference level terminal may be grounded or connected to another reference voltage source.
The second voltage dividing unit 31 is configured to form a voltage dividing circuit with the first voltage dividing unit 12 to increase the voltage of the output terminal of the first voltage stabilizing unit 11 when the voltage difference between the first signal terminal VLED and the second signal terminal VBL is greater than a preset voltage value, so as to increase the voltage of the first output terminal VBL.
The first voltage stabilizing unit 11 is configured to perform voltage stabilizing processing on a preceding-stage input voltage to obtain a stable voltage source, the first voltage dividing unit 12 is configured to perform voltage dividing processing on the stable voltage source output by the first voltage stabilizing unit 11 under the cooperation with the second voltage dividing unit 31 of the voltage follower module 30, and a voltage value at the first output end BVL can be increased after the voltage dividing processing. In the boost module 20, when the voltage value required by the first output terminal is constant, and when the voltage input by the first input terminal of the boost module 20 is higher, the boost module 20 with a lower boost ratio can obtain the required voltage value.
For example, the first output terminal of the boost module 20 needs to obtain a 120V voltage source, and when the voltage input at the first input terminal is 60V, the boost module 20 needs to boost the 60V voltage source to 120V, i.e. Δ V =60V.
After the power supply at the output end of the first voltage stabilizing unit 11 is divided by the second voltage dividing unit 31 and the first voltage dividing unit 12 of the voltage following module 30, the voltage value at the output end 102 of the voltage stabilizing module 10 may be increased to 90V, that is, when the voltage input at the first input end 201 is increased to 90V, the voltage boosting module 20 only needs to boost the voltage source of 90V to 120V, that is, Δ V =30V. In this case, the boosting ratio of the boosting module 20 is relatively low, and the boosting ratio is small, and thus, the boosting module can be realized by using conventional components.
In an optional embodiment, the voltage following module 30 further includes a linear feedback unit, the linear feedback unit includes a sensing element 321 and a switch element 322, and the sensing element 321 is powered to drive the switch element 322 to operate.
The first signal terminal VLED is connected to the second signal terminal VBL through the sensing element 321, and the second terminal of the second voltage divider unit 31 is connected to a reference level terminal through the switching element 322, wherein the reference level terminal may be grounded.
The sensing element 321 is configured to drive the switch element 322 to be completely turned on when a voltage difference between the first signal end VLED and the second signal end VBL is greater than a preset voltage value, so that the second end of the second voltage dividing unit 31 is grounded through the switch element 322, and the second voltage dividing unit 31 and the first voltage dividing unit 12 form a voltage dividing circuit to increase a voltage at an output end of the first voltage stabilizing unit 11.
The on-resistance of the switch element 322 decreases with the voltage of the sensing element 321, and when the switch element 322 is completely turned on, the on-resistance of the switch element 322 is almost zero.
In this embodiment, the linear feedback unit is adopted to isolate the voltage at the output end and the input end of the boost module 20, so as to prevent the high voltage at the output end of the boost module 20 from flowing back to the front-end voltage stabilization module 10 to cause impact, and protect the boost module 20 and the front-end voltage stabilization module 10. Meanwhile, the on-resistance of the switching element 322 decreases with the voltage of the sensing element 321, that is, the on-resistance of the switching element 322 decreases with the increase of the optical signal, and the switching element 322 plays a role of linear feedback under the action of the sensing element 321. If the voltage difference between the first signal terminal VLED and the second signal terminal VBL is large, the switch element 322 may be completely turned on, and at this time, the on-resistance of the switch element 322 is almost zero, so that voltage division is implemented between the second voltage division unit 31 and the first voltage division unit 12, and the voltage at the output end of the voltage stabilization module 10 may be raised to a preset value.
Optionally, the linear feedback unit may be an optical coupler, a light emitter PC1A of the optical coupler is the sensing component, and a light receiver PC1B of the optical coupler is the switch component. The opto-coupler is comparatively conventional isolation device, can play better isolation effect and linear feedback effect in the power module of this application, and the cost is lower, easily realizes.
In other embodiments, the linear feedback unit may also be a hall current sensor, or other linear feedback devices, which is not limited in this embodiment.
In an optional embodiment, the first voltage dividing unit 12 includes a first resistor R11, a second resistor R5, and a third resistor R13, the second voltage dividing unit 31 includes a fourth resistor R12, a voltage dividing circuit formed by a plurality of voltage dividing resistors can increase the voltage at the output terminal of the voltage stabilizing module 10, and the resistors are conventional components, so that the voltage dividing circuit is easy to implement and has a low cost.
The output end of the first voltage stabilizing unit 11 is connected to the second signal end VBL of the voltage follower circuit 30 through the first resistor R11 and the second resistor R5, the connection between the first resistor R11 and the second resistor R5 forms the voltage regulating end, and the output end of the first voltage stabilizing unit 11 is further grounded through a third resistor R13.
The sensing component is configured to drive the switch component 322 to be gradually turned on when a voltage difference between the first signal end VLED and the second signal end VBL is greater than a preset voltage value, so that the first resistor R11 is connected in series with the third resistor R13, then connected in parallel with the fourth resistor R12, and then connected in series with the second resistor R5 to divide voltage, so that a voltage value at an output end of the voltage stabilizing module 10 is raised.
In an alternative embodiment, the voltage following module 30 further includes a second voltage stabilizing unit 33, and the second voltage stabilizing unit 33 is connected between the sensing component 321 and the first signal terminal VLED. The second voltage stabilization unit 33 may include a zener diode Z1 and a zener diode Z2.
Optionally, the regulated voltage value of the second voltage regulation unit 33 may affect the voltage regulation value of the voltage regulation module 10, and if the regulated voltage value of the second voltage regulation unit 33 is larger, the voltage value of the first output terminal VBL of the voltage regulation module 10 is larger, that is, the adjustable voltage value Δ V is larger. If the resistances of the voltage-dividing resistors of the first voltage-dividing unit 12 and the second voltage-dividing unit 31 are very small, that is, the influence of the voltage-dividing resistors on Δ V is almost zero, the adjustable voltage value Δ V of the first output terminal VBL of the voltage-stabilizing module 10 is basically determined by the second voltage-stabilizing unit 33. Therefore, the regulated voltage value of the second voltage regulation unit 33 may be taken as the preset voltage value.
For example, the voltage value of the output end of the boost module 20 is VLED, the voltage value of the second voltage stabilizing unit 33 is Z1+ Z2, and if the voltage value of VLED exceeds (VBL + Z1+ Z2), the light emitter PC1A of the optical coupler of the voltage follower module 30 is powered on to emit light, the light receiver PC1B of the optical coupler senses a light signal, and the smaller the on-resistance on the light receiver PC1B is, the smaller the on-resistance of the light receiver PC1B plays a corresponding role in the voltage dividing circuit, thereby increasing the voltage value of the output end VBL of the voltage stabilizing module 10. In other embodiments, if the vcbs with different voltage regulation values are selected, the voltage difference Δ V between VBL and VLED may be set, that is, the voltage difference between VBL and VLED may be determined by the voltage regulation value of the vcbs.
In the above embodiment, when the sensing component is not turned on, the voltage value of the output end VBL of the voltage stabilizing module 10 may be calculated according to the following formula: VBL = (2.5V/R13) (R5 + R11+ R13). With the voltage rise of the output end VLED of the boost module 20, when the voltage VLED is higher than the voltage VBL, the second voltage stabilizing unit 33 may be broken down, so that the voltage regulator tube Z1 and the voltage regulator tube Z2 are turned on, the voltage VBL of the output end of the voltage regulator module 10 rises, and the voltage that can be raised is about V (LED) -VZ1-VZ2.
If the switch element 322 of the sensing element is completely turned on, the on-resistance of the switch element 322 is almost zero, and at this time, the voltage of the output end VBL of the voltage stabilizing module 10 may be: VBL = (1 + R5/((R11 + R13)// R13)) + 2.5V/R13 (R13 + R11).
As described above, if the difference between the voltage value of the first signal terminal VLED of the voltage follower module 30 and the voltage value of the second signal terminal VBL is greater than the preset voltage value, the current of the power output terminal VOUT flows from the first signal terminal VLED to the second signal terminal VBL, so that the light emitter PC1A of the optical coupler is turned on, and when the light receiver PC1B senses the optical signal of the light emitter PC1A, the light emitter PC1A is gradually turned on, so that a linear feedback signal is transmitted to the voltage regulation terminal 103 of the regulator module 10. When the light receiver PC1B of the optocoupler is completely turned on, the fourth resistor R12, the first resistor R11, the second resistor R5, and the third resistor R13 may be divided together, so that the voltage of the first output terminal VBL of the voltage stabilizing module 10 is raised. Under the condition that the required output end voltage is not changed, if the voltage at the input end of the voltage boosting module 30 is increased, the voltage boosting ratio of the voltage boosting module 30 can be reduced, that is, the work of the voltage boosting module 30 is less.
Optionally, because the first end ground connection of the photic ware PC1B of opto-coupler, the second end is connected to voltage regulation end 103 of voltage stabilizing module 10 through fourth voltage divider resistance R12, at this moment, fourth voltage divider resistance R12 participates in the bleeder circuit of voltage stabilizing module 10, and the on-resistance of the photic ware of opto-coupler is nearly zero, do not participate in the bleeder circuit of voltage stabilizing module 10, thereby make the voltage value of the first output end VBL of voltage stabilizing module 10 obtain raising, and then reduce boost ratio of boost module 20, boost module 20 only adopt conventional components and parts can.
On the basis of the above embodiment, the voltage following module 30 further includes a current limiting unit 34, where the current limiting unit 34 is connected in parallel to two ends of the sensing element 321, and adjusts the conducting voltage of the sensing element 321.
The current limiting unit 34 may include one current limiting element or a plurality of current limiting elements. Optionally, the current limiting unit includes a first current limiting element R2 and a second current limiting element R3, and the first signal terminal VBL is connected to the second signal terminal VLED through the second voltage stabilizing unit 33, the first current limiting element R2, and the second current limiting element R3. And a light emitter PC1A of the optical coupler is connected in parallel with two ends of the second current limiting element R3. The first current limiting element R2 and the second current limiting element R3 are connected in series, the current is limited and the voltage is divided, if the voltage difference between two ends of the second current limiting element R3 is larger than the conducting voltage of the light emitter PC1A of the optical coupler, the light emitter PC1A is conducted to light a light emitting signal, and then the light receiver PC1B of the optical coupler is triggered to conduct linearly, and the linear conduction can be understood that the larger the light signal of the light emitter PC1A is, the smaller the conducting resistance of the light receiver PC1B is.
Alternatively, the current limiting element may be a current limiting resistor or other current limiting elements.
The first voltage stabilizing unit 11 may include a reference voltage comparator U1, the reference voltage comparator U1 having an anode a, a cathode K and a reference electrode R, the anode a of the reference voltage comparator U1 being connected to a reference level terminal (ground), the cathode thereof being connectable to a first input terminal of the voltage stabilizing module 10, the reference electrode and the cathode thereof forming the first output terminal therebetween. The reference voltage comparator U1 is a controllable precise voltage-regulator tube TL431, the internal reference voltage value of the TL431 is 2.5V, and when the voltage value of the input end is larger than 2.5V, the output end of the TL431 can output any voltage value between 2.5V and 36V.
In other embodiments, the first voltage stabilization unit 11 may also be implemented by other circuit structures.
In an alternative embodiment, as shown in fig. 3, the boosting module 30 includes a boosting unit (L1 or L2) and a power switching unit Q1; the first ends of the boosting units (L1 and L2) are connected to the first output end (VBL) of the voltage stabilization module 10, and the second ends thereof are connected to the power output end VOUT. The boosting unit can be a transformer or a boosting inductor.
The power switch unit Q1 comprises a first current input end, a first current output end and a first controlled end, wherein the first current input end is connected with the second end of the voltage boosting unit (L1 and L2) and the power output end, the first current output end is grounded, and the first controlled end is used for being connected with the signal output end of the controller to receive a control signal.
In this embodiment, the circuit of the boost module is not limited, and in other embodiments, the boost module may also have other forms of circuit structures.
The utility model discloses a voltage follower circuit of above-mentioned embodiment, through set up voltage follower circuit between the first output and the first input at the module that steps up, when the magnitude of voltage of the first output of the module that steps up exceeds the magnitude of voltage of first input and predetermines the magnitude of voltage, the module that steps up of the module that steps up is than when higher promptly, first output has the electric current to flow through voltage follower module, voltage follower module just can feed back the signal of telecommunication to front end voltage stabilizing module, voltage follower module and front end voltage stabilizing module combined action are down with the voltage regulation of voltage stabilizing module's first output, the step-up ratio of the module that steps up can reduce. Therefore, the boost module can be realized only by adopting conventional components without adopting components with larger specifications, and the cost of the whole power module is reduced.
According to another aspect of the present invention, there is provided a power supply module including the voltage follower circuit described in the above embodiment.
According to another aspect of the present invention, there is provided an electronic device, including the power consumption load and the power module described in the above embodiment, the power consumption load is connected to the power output terminal of the power module.
The electronic device may be an intelligent device such as a liquid crystal television, an intelligent television, an interactive tablet, and the like, which is not limited in this embodiment.
Apply to power module and electronic equipment with the voltage follower circuit of record of above-mentioned embodiment, through set up the voltage follower circuit between the first output and the first input of boost module, when the magnitude of voltage of the first output of boost module is higher than the magnitude of voltage of first input more than when, the boost ratio of boost module is than promptly, first output has the electric current to flow through the voltage follower module, the voltage follower module just can feed back the signal of telecommunication to front end voltage stabilizing module, and make the output voltage of voltage stabilizing module increase, thereby help reducing the boost ratio of rear end boost module, make the boost module adopt conventional components and parts to realize, the cost is lower.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A voltage follower circuit is characterized by comprising a power supply input end, a power supply output end, a voltage stabilizing module, a boosting module and a voltage follower module;
the power supply input end is used for being connected with an external power supply to obtain the external power supply, and the power supply output end is used for being connected with a rear-end electric load to provide a power supply;
the voltage stabilizing module is provided with a first input end, a first output end and a voltage regulating end, the first input end is connected with the power supply input end, and the first output end is connected with the input end of the boosting module;
the output end of the boosting module is connected with the output end of the power supply;
the voltage following module comprises a first signal end, a second signal end and a signal feedback end, wherein the first signal end of the voltage following module is connected with the output end of the boosting module, the second signal end of the voltage following module is connected with the first output end of the voltage stabilizing module, and the signal feedback end of the voltage following module is connected with the voltage regulating end of the voltage stabilizing module;
the voltage following module is used for generating a feedback signal and transmitting the feedback signal to the voltage regulating end of the voltage stabilizing module through the signal feedback end when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, so that the voltage of the first output end of the voltage stabilizing module is increased.
2. The voltage follower circuit of claim 1, wherein the voltage regulator module comprises a first voltage regulator unit and a first voltage divider unit, an output terminal of the first voltage regulator unit being connected to the first output terminal through the first voltage divider unit, the first voltage divider unit having the voltage regulation terminal,
the voltage following module comprises a second voltage division unit, a first end of the second voltage division unit is connected with the voltage regulation end, a second end of the second voltage division unit is connected with a reference level end,
the second voltage division unit is used for combining with the first voltage division unit to increase the voltage of the output end of the first voltage stabilization unit when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, so that the voltage of the first output end is increased.
3. The voltage follower circuit of claim 2, wherein the voltage follower module further comprises a linear feedback unit, the linear feedback unit comprises a sensing element and a switch element, the sensing element is powered to drive the switch element to operate,
the first signal end is connected to the second signal end through the sensing component, the second end of the second voltage division unit is connected to a reference level end through the switch component,
the sensing assembly is used for driving the switch assembly to be closed when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, so that the second end of the second voltage division unit is connected to a reference level end through the switch assembly, and the voltage of the output end of the first voltage stabilization unit is increased by the second voltage division unit and the first voltage division unit in a voltage division circuit.
4. The voltage follower circuit of claim 3 wherein the first voltage divider unit comprises a first resistor, a second resistor, and a third resistor, and wherein the second voltage divider unit comprises a fourth resistor;
the output end of the first voltage stabilizing unit is connected with a second signal end of the voltage follower circuit through the first resistor and the second resistor, the voltage adjusting end is formed at the joint of the first resistor and the second resistor, and the output end of the first voltage stabilizing unit is also connected to a reference level end through a third resistor;
the sensing assembly is used for driving the switch assembly to be closed when the voltage difference value between the first signal end and the second signal end is larger than a preset voltage value, so that the first resistor is connected with the third resistor in series, then connected with the fourth resistor in parallel and then connected with the second resistor in series for voltage division.
5. The voltage follower circuit of claim 3, wherein the linear feedback unit is an optocoupler, wherein a light emitter of the optocoupler is the sensing component, and a light receiver of the optocoupler is the switching component.
6. The voltage follower circuit of any of claims 3-5, wherein the voltage follower module further comprises a second voltage regulator unit coupled between the sensing component and the first signal terminal.
7. The voltage follower circuit of any of claims 3-5, wherein the voltage follower module further comprises a current limiting unit connected in parallel across the inductive component.
8. The voltage follower circuit of claim 2 wherein the first regulator unit comprises a reference voltage comparator having an anode, a cathode, and a reference pole, the anode of the reference voltage comparator being connected to a reference level terminal, the cathode of the reference voltage comparator being connected to the first input terminal of the regulator module, the reference pole and the cathode of the reference voltage comparator forming the first output terminal therebetween.
9. A power supply module comprising a voltage follower circuit as claimed in any of claims 1 to 8.
10. An electronic device comprising an electrical load and a power module as claimed in claim 9, said electrical load being connected to a power output of said power module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222119215.8U CN218850626U (en) | 2022-08-11 | 2022-08-11 | Voltage follower circuit, power module and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222119215.8U CN218850626U (en) | 2022-08-11 | 2022-08-11 | Voltage follower circuit, power module and electronic equipment |
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| CN218850626U true CN218850626U (en) | 2023-04-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117740182A (en) * | 2024-02-19 | 2024-03-22 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117740182A (en) * | 2024-02-19 | 2024-03-22 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
| CN117740182B (en) * | 2024-02-19 | 2024-05-03 | 成都市易冲半导体有限公司 | Thermistor detection circuit and terminal equipment |
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