CN218549738U - Power supply control circuit and device - Google Patents
Power supply control circuit and device Download PDFInfo
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- CN218549738U CN218549738U CN202221845005.0U CN202221845005U CN218549738U CN 218549738 U CN218549738 U CN 218549738U CN 202221845005 U CN202221845005 U CN 202221845005U CN 218549738 U CN218549738 U CN 218549738U
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Abstract
The application provides a power supply control circuit and a power supply control device, which comprise a rectification filtering module, a first voltage control module and a second voltage control module, wherein the rectification filtering module is used for performing rectification filtering on input voltage and outputting a first direct current voltage; the voltage sampling module is used for dividing the first direct-current voltage to obtain a reference voltage and a second direct-current voltage; the voltage comparator module is used for comparing the second direct-current voltage with the reference voltage to obtain a comparison voltage; the switch control module determines the opening state of the first field effect tube according to the magnitude of the comparison voltage and obtains a third direct current voltage; and the enabling input module determines an enabling voltage according to the third direct current voltage and determines the size of the output voltage according to the enabling voltage and the first direct current voltage. By the method, the power-on stability of the equipment can be improved.
Description
Technical Field
The present disclosure relates to circuit technologies, and particularly to a power control circuit and a power control device.
Background
When the current security protection IPC equipment (hereinafter referred to as equipment for short) is applied outdoors, the problems of long installation distance and difficult power supply and wiring are often encountered, especially in some remote or open places. In order to solve the problem, part of customers use a scheme of a solar panel and a storage battery or a scheme of the solar panel, the storage battery and an inverter to supply power for equipment. The difference is that the former supplies dc power to the device and the latter supplies ac power to the device. However, in either scheme, the solar battery is used for charging the storage battery, so that the voltage of the storage battery is slowly increased, and the equipment may not stably operate under the input voltage which continuously changes.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, it is an object of the present application to provide a power control circuit and apparatus, which can improve the power-on stability of a device.
In a first aspect, an embodiment of the present application provides a power control circuit, including:
the rectification filtering module is used for rectifying and filtering the input voltage and outputting a first direct current voltage;
the voltage sampling module is connected with the output end of the rectifying and filtering module and divides the first direct-current voltage to obtain a reference voltage and a second direct-current voltage;
the voltage comparator module is connected with the output end of the voltage sampling module and the output end of the voltage stabilizing power supply module and compares the second direct-current voltage with the reference voltage to obtain a comparison voltage;
the voltage stabilizing power supply module is connected with the output end of the rectifying and filtering module and provides an input power supply for the voltage comparator module;
the switch control module is connected with the output ends of the rectification filter module and the voltage comparator module, determines the opening state of the first field effect tube according to the magnitude of the comparison voltage, and obtains a third direct current voltage;
and the enabling input module is connected with the output ends of the rectifying and filtering module and the switch control module, determines enabling voltage according to the third direct current voltage, and determines the size of output voltage according to the enabling voltage and the first direct current voltage.
In an embodiment of the present application, the power control circuit further includes a voltage stabilizing power supply module, which is connected to the output terminal of the rectifying and filtering module and the input terminal of the voltage comparator module, and provides an input power for the voltage comparator module.
In an embodiment of the present application, the rectifying and filtering module includes a fuse, a rectifier bridge, and a first capacitor; the first end of the fuse is connected with input voltage, the second end of the fuse is connected with the first end of the rectifier bridge, the first end of the first capacitor is connected with the second end of the rectifier bridge, the second end of the first capacitor is grounded, and the voltage of the second end of the rectifier bridge is first direct-current voltage.
In an embodiment of the present application, the voltage sampling module includes a first resistor, a second resistor, a third resistor, and a three-terminal precision regulator; the first end of the first voltage is connected with a first direct-current voltage, and the second end of the first resistor is connected with the negative electrode of the three-end precision voltage-stabilizing source; the first end of the second resistor is connected with the first direct-current voltage, and the second end of the second resistor is connected with the first end of the third resistor and the negative electrode of a comparator in the voltage comparator module; the second end of the third resistor is grounded.
In an embodiment of the present application, the voltage comparator module includes a fourth resistor, a sixth resistor, a seventh resistor, a comparator and a second field effect transistor; the first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is connected with the drain electrode of the second field effect transistor; the first end of the sixth resistor is connected with the grid electrode of the second field effect tube; the source electrode of the second field effect tube is grounded; the second end of the sixth resistor is connected with the second end of the eighth resistor of the switch control module; the first end of the seventh resistor is connected with the second end of the fifth resistor of the voltage-stabilizing power supply module, and the second end of the seventh resistor is connected with the output end of the comparator; the grounding end of the comparator is grounded, and the power supply end of the comparator is connected with the second end of the fifth resistor.
In an embodiment of the present application, when the negative electrode of the comparator is lower than the first voltage threshold, the second field effect transistor is in a conducting state, and the second resistor, the third resistor, the fourth resistor and the first direct current voltage are used for determining the turn-on voltage of the power control circuit.
In an embodiment of the present application, when the negative pole of the comparator is higher than the first voltage threshold, the second field effect transistor is in an off state, and the second resistor, the third resistor and the first direct current voltage are used to determine the turn-off voltage of the power control circuit.
In an embodiment of the present application, the voltage-stabilizing power supply module includes a fifth resistor, a voltage-stabilizing tube, and a second capacitor; the first end of the fifth resistor is connected with the direct-current input voltage, and the second end of the fifth resistor is connected with the negative electrode of the voltage regulator tube and the first end of the second capacitor; the anode of the voltage regulator tube and the second end of the second capacitor are grounded.
In an embodiment of the present application, the switch control module includes an eighth resistor and a first field effect transistor; the drain electrode of the first field effect tube is connected with the second end of the fifth resistor; the grid electrode of the first field effect transistor is connected with the first end of the eighth resistor, the source electrode of the first field effect transistor is connected with the first end of the ninth resistor, and the voltage of the source electrode of the first field effect transistor is the third direct-current voltage.
In an embodiment of the present application, the enable input module includes a ninth resistor, a tenth resistor, a third capacitor, and a control chip; the second end of the ninth capacitor is connected with the first end of the tenth resistor, the enabling end of the control chip and the first end of the third capacitor; a second terminal of the tenth resistor and a second terminal of the third capacitor are grounded.
In a second aspect, an embodiment of the present application further provides a power control apparatus, including the power control circuit as described in the first aspect.
As mentioned above, the circuit board testing device of the application has the following beneficial effects:
the power supply control circuit enables the BUCK circuit to be started at a relatively high voltage position through the enable input module, and outputs direct-current voltage for powering on and starting equipment; the BUCK circuit can also be made to turn off at relatively low voltages. The starting voltage and the closing voltage have a certain difference value instead of a certain fixed voltage value, so that in the process that the voltage of the equipment rises gradually, even if the voltage jitter is generated by the input voltage at the moment of starting the equipment, the equipment cannot be started and closed frequently, the equipment can be started by electrifying smoothly, and the electrifying stability of the equipment is improved.
Drawings
Fig. 1 is a schematic diagram of a power control circuit according to an embodiment of the present disclosure;
FIG. 2 is a diagram of a power control circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram illustrating a dc alternative circuit of a rectifying and filtering module according to an embodiment of the present disclosure;
FIG. 4 is a circuit diagram of a voltage comparator module according to an embodiment of the present disclosure;
FIG. 5 is a schematic diagram illustrating power fluctuations for powering up a device according to an embodiment of the present disclosure;
FIG. 6 is a signal diagram of a simulation circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram illustrating a power control apparatus according to an embodiment of the present disclosure.
Detailed Description
The following embodiments of the present application are described by specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure of the present application. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present application, and the drawings only show the components related to the present application and are not drawn according to the number, shape and size of the components in actual implementation, and the type, number and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Before describing the embodiments of the present application, terms related to the embodiments of the present application will be explained.
The Rectifying circuit (Rectifying circuit) refers to a circuit capable of converting alternating current electric energy into direct current electric energy, and the Rectifying circuit in the embodiment of the present application may be a bridge Rectifying circuit.
A zener diode is a silicon-made surface-contact type transistor diode, which is called a zener diode for short. The diode is a semiconductor device having a very high resistance up to a critical reverse breakdown voltage. When the voltage regulator tube is in reverse breakdown, the terminal voltage is almost unchanged in a certain current range (or a certain power loss range), and the voltage regulator tube shows voltage-stabilizing characteristics, so that the voltage regulator tube is widely applied to voltage-stabilizing power supplies and amplitude limiting circuits.
The three-terminal precise voltage stabilizing source can reduce the voltage and output the voltage after stabilizing the voltage to a certain fixed value. The three-end precise voltage stabilizing source in the embodiment of the application can be TL431, and the TL431 is a parallel voltage stabilizing integrated circuit, so that the three-end precise voltage stabilizing source is widely applied to various power supply circuits due to good performance and low price. TL431 may include three poles: a K pole (negative pole), an a pole (positive pole), and an R pole (reference pole). When the voltage difference between the R pole and the a pole is greater than a certain threshold, the TL431 enters a conducting state, and at this time, the K pole outputs the same voltage value as the voltage difference between the R pole and the a pole.
A Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) is a Field-Effect Transistor that can be widely used in analog circuits and digital circuits. The MOSFETs in the embodiment of the present application may include N-channel depletion MOSFETs and P-channel depletion MOSFETs. The depletion MOSFET may include a Source (S), gate (G), and Drain (Drain, D) electrode. For a depletion-mode MOSFET, when the voltage difference between the S and G poles is greater than the turn-on voltage, the voltage of the D pole is approximately equal to the voltage of the S pole.
Ground (GND), the most common Ground, is generally considered as the reference Ground in the circuit, and the potential of the Ground signal is 0V.
The open-drain output is that voltage is not output, the pin is grounded when the control outputs low level, and the pin does not output high level or low level when the control outputs high level, and is in a high impedance state. If the pull-up resistor is externally connected, the voltage can be pulled to the power supply voltage of the pull-up resistor when the high level is output. This mode is suitable for when the peripheral voltage of connection is lower than singlechip voltage.
Referring to fig. 1, fig. 1 is a schematic diagram of a power control circuit according to an embodiment of the present disclosure, and as shown in fig. 1, the architecture of the power control circuit includes: the device comprises a rectification filtering module, a voltage sampling module, a voltage comparator module, a voltage stabilizing power supply module, a switch control module and an enabling input module. The input end of the rectifying and filtering module is connected with an input voltage, the input voltage can be a direct current voltage or an alternating current voltage, and the rectifying and filtering module can filter the input voltage to obtain a first direct current voltage. The input end of the voltage sampling module is connected with the output end of the rectifying and filtering module, and the first direct-current voltage can be divided to obtain the reference voltage. The input end of the voltage comparator is connected with the voltage sampling module and the voltage-stabilizing power supply module, wherein the input end of the voltage-stabilizing power supply module is connected with the rectifying and filtering module. The light-on control module is connected with the output end of the rectifying and filtering module and the output end of the voltage comparator module through a fifth resistor. The input end of the enabling input module (namely the BUCK circuit module) is connected with the output end of the switch control module and the output end of the rectification filter module.
The power control circuit provided by the embodiment of the present application is described in detail below with reference to fig. 2. Referring to fig. 2, fig. 2 is a diagram of a power control circuit according to an embodiment of the present disclosure, the power control circuit includes:
the rectifying and filtering module 210 rectifies and filters the input voltage and outputs a first direct current voltage.
The rectifying and filtering module comprises a fuse (F1), a rectifying bridge (D1) and a first capacitor (C1). The first end of the fuse is connected with an input voltage (Vin), the second end of the fuse is connected with the first end of the rectifier bridge, the first end of the first capacitor is connected with the second end of the rectifier bridge, the second end of the first capacitor is grounded, and the voltage of the second end of the rectifier bridge is a first direct-current Voltage (VHH). Wherein, C1 may be an electrolytic capacitor, the number of C1 may be one or more, vin may be an ac input voltage, and the first terminal of F1 may be connected to the positive electrode of Vin. The rectifier bridge may perform rectification filtering on the ac input voltage to obtain the VHH.
In an embodiment of the present application, vin may also be a dc input voltage, and when Vin is the dc input voltage, it may be connected without polarity, i.e. it is not necessary to distinguish between positive and negative, and the rectifier and filter module at this time needs to be changed into an alternative circuit as shown in fig. 3. In the alternative circuit shown in fig. 3, the rectifier bridge (D1) is replaced by a single rectifier diode (D1), the anode of which is connected to the second terminal of the fuse and the cathode of which is connected to the first terminal of the first capacitor. At the moment, the positive and negative of the direct current input voltage are distinguished when the direct current input voltage is input, the positive pole of the direct current input voltage is connected with the Vin + port, and the negative pole of the direct current input voltage is connected with the Vin-port. After rectification by the rectifier diode, a first direct current voltage, namely VHH, can be obtained.
It should be noted that, in this embodiment of the application, if there is no special description, for an element having two ports or pins, the first end refers to a left end or an upper end of the element, and the second end refers to a right end or a lower end of the element. Specifically, when the component is placed horizontally, the first end refers to the left end, and the second end refers to the right end; when the component is placed longitudinally, the first end refers to the upper end and the second end refers to the lower end.
And the voltage sampling module 220 is connected with the output end of the rectifying and filtering module and divides the first direct-current voltage to obtain a reference voltage and a second direct-current voltage.
The voltage sampling module comprises a first resistor (R1), a second resistor (R2), a third resistor (R3) and a three-terminal precise voltage regulator (D2). The three-segment precision voltage stabilizing source can be a general-purpose device TL431. The first end of the first voltage is connected with the first direct-current voltage, and the second end of the first resistor is connected with the negative electrode (K pole) of the three-end precision voltage-stabilizing source; the first end of the second resistor is connected with the first direct-current voltage, and the second end of the second resistor is connected with the first end of the third resistor and the negative electrode of a comparator in the voltage comparator module; the second end of the third resistor is grounded.
The reference voltage of the general-purpose device TL431, which may be 2.5V, may be the positive input of the comparator (U1) in the voltage comparator block. The VHH is divided by R2 and R3 to obtain a second direct current voltage which can be used as the negative electrode input of U1, as shown by Vi in figure 2. When Vi =2.5V, the corresponding VHH is the enable-on input voltage of the BUCK circuit at this time. In addition, the resistor R1 is used to provide the necessary on-current for TL431, and needs to satisfy the following conditions:
(VHH-2.5V)/R1＞1mA。
and the voltage comparator module 230 is connected to the output end of the voltage sampling module and the output end of the voltage stabilizing power supply module, and compares the second direct-current voltage with the reference voltage to obtain a comparison voltage.
The voltage comparator module comprises a fourth resistor (R4), a sixth resistor (R6), a seventh resistor (R7), a comparator (U1) and a second field effect transistor (Q1). The first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is connected with the drain electrode (D pole) of the second field effect transistor; a first end of the sixth resistor is connected with a grid (G pole) of the second field effect tube; the source electrode (S pole) of the second field effect transistor is grounded; the second end of the sixth resistor is connected with the second end of the eighth resistor of the switch control module; the first end of the seventh resistor is connected with the second end of the fifth resistor of the voltage-stabilizing power supply module, and the second end of the seventh resistor is connected with the output end of the comparator; the grounding end of the comparator is grounded, and the power supply end of the comparator is connected with the second end of the fifth resistor.
The second field effect transistor may be an N-channel enhancement type MOS transistor. U1 adopts can be single-channel ultra-low power consumption comparator, and the model can select for use: and (5) TS391. Because of the open-drain output, a pull resistor R7 is required to be added, and the resistance value can be 22k omega. As shown in fig. 4, the positive input of the comparator may be a reference voltage of 2.5V, and the negative input is a second dc voltage, i.e., vi, obtained by dividing the first dc Voltage (VHH) by a resistor network composed of R2, R3, and R4. The resistor R6 mainly has the function of preventing the gate switching signal of the MOS transistor from overshooting, and the resistance value can be 33 omega.
In an embodiment of the present application, when the negative electrode of the comparator is lower than the first voltage threshold, the second field effect transistor is in a conducting state, and the second resistor, the third resistor, the fourth resistor, and the first direct current voltage are used to determine the turn-on voltage of the power control circuit. The first voltage threshold may be determined according to characteristics of TL431, and the first voltage threshold is described as 2.5V:
illustratively, when the input voltage Vin is gradually increased and Vi is less than or equal to 2.5V, U1 outputs high level and Q1 is conducted. At this time, the lower half part of the divider resistor is actually an equivalent resistor (the resistance of the Q1 is negligible when the Q1 is switched on) formed by connecting the resistors R3 and R4 in parallel, and the resistance of the equivalent resistor is as follows:
R＝(R3*R4)/(R3+R4)。
in an embodiment of the present application, when the negative electrode of the comparator is higher than the first voltage threshold, the second field effect transistor is in an off state, and the second resistor, the third resistor and the first direct current voltage are used to determine the off-voltage of the power control circuit.
Illustratively, when the input voltage Vin is rising and Vi > 2.5V, U1 outputs a low level and Q1 is off. The lower half part of the divider resistor is R3; r3 > R.
From the above parameters, the turn-on voltage (Va) and the turn-off voltage (Vb) of the BUCK circuit are respectively:
Va＝VHH*R/(R2+R)；
Vb＝VHH*R3/(R2+R3)；
through calculation:
Va/Vb＝1+R2*R3/(R2+R3)*R4＞1。
therefore, according to the actual input voltage value of the device, the appropriate input voltage range for turning on and off the BUCK circuit can be obtained by selecting the appropriate resistors R2, R3 and R4.
As shown in fig. 5, the power control circuit in the embodiment of the present application may be used as an extension circuit of an Enable (EN) pin of a BUCK circuit control chip, and may turn on the control chip at a set input voltage value, which is defined as a turn-on voltage and is set as Va; off at a relatively low voltage, defined as the off voltage, set to Vb. After the BUCK circuit is conducted at the point Va, the BUCK circuit cannot be turned off as long as voltage fluctuation is not lower than Vb, and power is stably supplied to equipment. With the conventional method, the BUCK circuit is turned on when the VHH voltage rises to the threshold voltage (Vth), as shown at points a and b in fig. 5; at this time, as long as the VHH is jittered and the voltage is lower than Vth, the BUCK circuit is turned off immediately, as shown at points c and d in fig. 1, and this switching state may be repeated all the time. The method can avoid the design defects.
And the voltage stabilizing power supply module 240 is connected with the output end of the rectifying and filtering module and the input end of the voltage comparator module and provides an input power supply for the voltage comparator module.
The voltage-stabilizing power supply module comprises a fifth resistor (R5), a voltage-stabilizing tube (D3) and a second capacitor (C2); the first end of the fifth resistor is connected with the direct-current input voltage, and the second end of the fifth resistor is connected with the negative electrode of the voltage regulator tube and the first end of the second capacitor; the anode of the voltage regulator tube and the second end of the second capacitor are grounded.
The comparator U1 may be a wide voltage input, allowing an input voltage range of 2V to 34V (direct current (DC)). When the highest input voltage does not exceed DC 34V, the voltage regulator tube (D3) theoretically does not need to be connected with a piece. When the highest input voltage is close to or exceeds DC 34V, D1 suggests that a Zener diode with a breakdown voltage not higher than DC 28V be used. The resistor R5 is used for limiting the current of the voltage regulator tube D3, and the resistance value can be 1 kiloohm (kiloohm). And the second capacitor (C2) is used for filtering the power input of the U1, and the capacitance value can be 10uf (farad).
And the switch control module 250 is connected with the output ends of the rectification filter module and the voltage comparator module, determines the opening state of the first field effect tube according to the comparison voltage, and obtains a third direct current voltage.
The switch control module comprises an eighth resistor (R8) and a first field effect transistor (Q2). The drain electrode (D pole) of the first field effect tube is connected with the second end of the fifth resistor; the grid electrode (G pole) of the first field effect transistor is connected with the first end of the eighth resistor, the source electrode (S pole) of the first field effect transistor is connected with the first end of the ninth resistor, and the voltage of the source electrode of the first field effect transistor is the third direct current voltage.
Wherein, Q2 can be a P-channel enhancement type MOS tube. When the comparator U1 outputs a high level, Q2 is cut off, and the third direct current voltage VCC is a low level; when U1 outputs a low level, Q2 is turned on and the third dc voltage is pulled up to a high level by R5.
And the enable input module 260 is connected with the output ends of the rectification filter module and the switch control module, determines an enable voltage according to the third direct-current voltage, and determines the magnitude of the output voltage according to the enable voltage and the first direct-current voltage.
The enabling input module comprises a ninth resistor (R9), a tenth resistor (R10), a third capacitor (C3) and a control chip (U2). The second end of the ninth capacitor is connected with the first end of the tenth resistor, the enabling end of the control chip and the first end of the third capacitor; a second terminal of the tenth resistor and a second terminal of the third capacitor are grounded. The enable input module may be a direct current-direct current (DC-DC) enable input module.
In one embodiment of the present application, when Q2 is turned off, the voltage of the enable pin (EN) of U2 is pulled down to ground by the resistor R10, and U2 does not operate; when Q2 is turned on, the enable pin EN input voltage of U2 is:
Ven＝VCC*R10/(R9+R10)。
in one embodiment of the present application, when both R9 and R10 are 10k Ω, the input voltage of the EN pin is VCC/2. Then U2 starts to operate when VHH is greater than the EN pin threshold voltage.
Fig. 6 is a signal diagram of an emulation circuit according to an embodiment of the present application. The dotted line represents the up-down power process of the first direct current Voltage (VHH), the thin solid line represents the output waveform of the operational amplifier U1, and the thick solid line represents the input voltage of the U2 enable pin. In the figure, va is a set BUCK circuit start voltage, and Vb is a BUCK circuit off voltage. It can be seen that Va is greater than Vb. When the voltage of the equipment rises slowly and is electrified and started, the BUCK circuit cannot be restarted as long as the fluctuation of the input voltage is not lower than Vb, and therefore the electrifying stability of the equipment can be effectively improved.
Referring to fig. 7, fig. 7 is a schematic diagram of a power control apparatus according to an embodiment of the present disclosure, where the power control apparatus may include the power control circuit shown in fig. 1. Specifically, the power supply control device includes:
a rectifying and filtering module 210 for rectifying and filtering the input voltage and outputting a first dc voltage;
the voltage sampling module 220 is connected to the output end of the rectifying and filtering module 210, and divides the first direct-current voltage to obtain a reference voltage and a second direct-current voltage;
the voltage comparator module 230 is connected to the output end of the voltage sampling module 220, and compares the second direct-current voltage with the reference voltage to obtain a comparison voltage;
a switch control module 250, connected to the output ends of the rectification filter module 210 and the voltage comparator module 230, for determining the on state of the first field effect transistor according to the magnitude of the comparison voltage, and obtaining a third dc voltage;
and the enable input module 260 is connected to the output ends of the rectifying and filtering module 210 and the switch control module 250, determines an enable voltage according to the third direct-current voltage, and determines the magnitude of the output voltage according to the enable voltage and the first direct-current voltage.
In an embodiment of the present application, the power control circuit further includes a voltage stabilizing power supply module 240, which is connected to the output terminal of the rectifying and filtering module 210 and the input terminal of the voltage comparator module 230, and provides an input power for the voltage comparator module 230.
In an embodiment of the present application, the rectifying and filtering module 210 includes a fuse, a rectifier bridge, and a first capacitor; the first end of fuse is connected input voltage, and the second end of fuse is connected the first end of rectifier bridge, and the second end of rectifier bridge is connected to the first end of first electric capacity, and the second end of first electric capacity ground connection, the voltage of the second end of rectifier bridge is first direct current voltage.
In an embodiment of the present application, the voltage sampling module 220 includes a first resistor, a second resistor, a third resistor, and a three-terminal precision regulator; the first end of the first voltage is connected with a first direct-current voltage, and the second end of the first resistor is connected with the negative electrode of the three-end precision voltage-stabilizing source; a first end of the second resistor is connected to the first dc voltage, and a second end of the second resistor is connected to a first end of the third resistor and a negative electrode of the comparator in the voltage comparator module 230; the second end of the third resistor is grounded.
In an embodiment of the present application, the voltage comparator module 230 includes a fourth resistor, a sixth resistor, a seventh resistor, a comparator and a second field effect transistor; the first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is connected with the drain electrode of the second field effect transistor; the first end of the sixth resistor is connected with the grid electrode of the second field effect transistor; the source electrode of the second field effect tube is grounded; a second end of the sixth resistor is connected to a second end of the eighth resistor of the switch control module 250; a first end of the seventh resistor is connected to a second end of the fifth resistor of the voltage stabilizing and power supplying module 240, and a second end of the seventh resistor is connected to the output end of the comparator; the grounding end of the comparator is grounded, and the power supply end of the comparator is connected with the second end of the fifth resistor.
In an embodiment of the present application, when the negative electrode of the comparator is lower than the first voltage threshold, the second field effect transistor is in a conducting state, and the second resistor, the third resistor, the fourth resistor and the first direct current voltage are used for determining the turn-on voltage of the power control circuit.
In an embodiment of the present application, when the negative voltage of the comparator is higher than the first voltage threshold, the second field effect transistor is in an off state, and the second resistor, the third resistor and the first direct current voltage are used for determining the turn-off voltage of the power control circuit.
In an embodiment of the present application, the voltage-stabilizing power supply module 240 includes a fifth resistor, a voltage-stabilizing tube, and a second capacitor; the first end of the fifth resistor is connected with the direct-current input voltage, and the second end of the fifth resistor is connected with the negative electrode of the voltage regulator tube and the first end of the second capacitor; the anode of the voltage regulator tube and the second end of the second capacitor are grounded.
In an embodiment of the present application, the switch control module 250 includes an eighth resistor and a first field effect transistor; the drain electrode of the first field effect tube is connected with the second end of the fifth resistor; the grid electrode of the first field effect transistor is connected with the first end of the eighth resistor, the source electrode of the first field effect transistor is connected with the first end of the ninth resistor, and the voltage of the source electrode of the first field effect transistor is a third direct-current voltage.
In an embodiment of the present application, the enable input module 260 includes a ninth resistor, a tenth resistor, a third capacitor, and a control chip; the second end of the ninth capacitor is connected with the first end of the tenth resistor, the enabling end of the control chip and the first end of the third capacitor; the second end of the tenth resistor and the second end of the third capacitor are grounded.
The above embodiments are merely illustrative of the principles and utilities of the present application and are not intended to limit the application. Any person skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present application. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical concepts disclosed in the present application shall be covered by the claims of the present application.
Claims (10)
1. A power control circuit, comprising:
the rectification filtering module is used for rectifying and filtering the input voltage and outputting a first direct current voltage;
the voltage sampling module is connected with the output end of the rectifying and filtering module and divides the first direct-current voltage to obtain a reference voltage and a second direct-current voltage;
the voltage comparator module is connected with the output end of the voltage sampling module and compares the second direct-current voltage with the reference voltage to obtain a comparison voltage;
the switch control module is connected with the output ends of the rectification filter module and the voltage comparator module, determines the opening state of the first field effect tube according to the comparison voltage and obtains a third direct current voltage;
and the enabling input module is connected with the output ends of the rectifying and filtering module and the switch control module, determines an enabling voltage according to the third direct-current voltage, and determines the size of an output voltage according to the enabling voltage and the first direct-current voltage.
2. The power control circuit of claim 1, further comprising:
and the voltage stabilizing power supply module is connected with the output end of the rectifying and filtering module and the input end of the voltage comparator module and provides an input power supply for the voltage comparator module.
3. The power control circuit of claim 1, wherein the rectifying and filtering module comprises a fuse, a rectifying bridge and a first capacitor; the first end of the fuse is connected with the input voltage, the second end of the fuse is connected with the first end of the rectifier bridge, the first end of the first capacitor is connected with the second end of the rectifier bridge, the second end of the first capacitor is grounded, and the voltage of the second end of the rectifier bridge is the first direct-current voltage.
4. The power supply control circuit according to claim 1, wherein the voltage sampling module comprises a first resistor, a second resistor, a third resistor and a three-terminal precision voltage regulator; the first end of the first resistor is connected with the first direct-current voltage, and the second end of the first resistor is connected with the negative electrode of the three-end precise voltage-stabilizing source; the first end of the second resistor is connected with the first direct-current voltage, and the second end of the second resistor is connected with the first end of the third resistor and the negative electrode of a comparator in the voltage comparator module; and the second end of the third resistor is grounded.
5. The power control circuit of claim 4, wherein the voltage comparator module comprises a fourth resistor, a sixth resistor, a seventh resistor, a comparator and a second field effect transistor; the first end of the fourth resistor is connected with the second end of the second resistor, and the second end of the fourth resistor is connected with the drain electrode of the second field effect transistor; the first end of the sixth resistor is connected with the grid electrode of the second field effect transistor; the source electrode of the second field effect tube is grounded; the second end of the sixth resistor is connected with the second end of the eighth resistor of the switch control module; the first end of the seventh resistor is connected with the second end of a fifth resistor of the voltage-stabilizing power supply module, and the second end of the seventh resistor is connected with the output end of the comparator; the grounding end of the comparator is grounded, and the power supply end of the comparator is connected with the second end of the fifth resistor;
the voltage stabilizing power supply module comprises the fifth resistor, a voltage stabilizing tube and a second capacitor; the first end of the fifth resistor is connected with the first direct-current voltage, and the second end of the fifth resistor is connected with the negative electrode of the voltage regulator tube and the first end of the second capacitor; and the anode of the voltage regulator tube and the second end of the second capacitor are grounded.
6. The power control circuit of claim 5, wherein the second field effect transistor is in a conducting state when the negative pole of the comparator is lower than a first voltage threshold, and the second resistor, the third resistor, the fourth resistor and the first direct current voltage are used for determining a turn-on voltage of the power control circuit.
7. The power control circuit of claim 5, wherein the second field effect transistor is in an off state when the negative terminal of the comparator is higher than a first voltage threshold, and wherein the second resistor, the third resistor and the first DC voltage are used to determine an off voltage of the power control circuit.
8. The power control circuit of claim 5, wherein said switch control module comprises said eighth resistor and said first field effect transistor; the drain electrode of the first field effect tube is connected with the second end of the fifth resistor; the grid electrode of the first field effect transistor is connected with the first end of the eighth resistor, the source electrode of the first field effect transistor is connected with the first end of the ninth resistor, and the voltage of the source electrode of the first field effect transistor is the third direct-current voltage.
9. The power control circuit of claim 8, wherein the enable input module comprises the ninth resistor, a tenth resistor, a third capacitor and a control chip; the second end of the ninth resistor is connected with the first end of the tenth resistor, the enabling end of the control chip and the first end of the third capacitor; a second terminal of the tenth resistor and a second terminal of the third capacitor are grounded.
10. A power supply control device comprising the power supply control circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221845005.0U CN218549738U (en) | 2022-07-18 | 2022-07-18 | Power supply control circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221845005.0U CN218549738U (en) | 2022-07-18 | 2022-07-18 | Power supply control circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN218549738U true CN218549738U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221845005.0U Active CN218549738U (en) | 2022-07-18 | 2022-07-18 | Power supply control circuit and device |
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| Country | Link |
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| CN (1) | CN218549738U (en) |
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- 2022-07-18 CN CN202221845005.0U patent/CN218549738U/en active Active
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