CN217087492U - Over-voltage and under-voltage protection circuit and power supply equipment - Google Patents
Over-voltage and under-voltage protection circuit and power supply equipment Download PDFInfo
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- CN217087492U CN217087492U CN202220646842.4U CN202220646842U CN217087492U CN 217087492 U CN217087492 U CN 217087492U CN 202220646842 U CN202220646842 U CN 202220646842U CN 217087492 U CN217087492 U CN 217087492U
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Abstract
The utility model relates to a power supply circuit protects technical field, concretely relates to cross undervoltage protection circuit and power supply unit, this circuit includes overvoltage protection module, undervoltage protection module and power supply control module, overvoltage protection module's input is used for receiving initial voltage, undervoltage protection module's input is connected to overvoltage protection module's output, power supply control module's input is connected to undervoltage protection module's output, power supply control module's output is used for connecting the load, power supply control module's input still is used for receiving initial voltage. The utility model discloses can be based on its circuit structure, follow the power supply circuit of cut-off load in the source when the magnitude of voltage surpasss and predetermine the scope, the overvoltage protection and the undervoltage protection of more effectual realization load need not additionally design the comparison reference circuit in addition and assist electric power supply circuit, and circuit structure is simple, and is with low costs, and the facilitate promotion is used.
Description
Technical Field
The utility model relates to a power supply circuit protects technical field, concretely relates to cross undervoltage protection circuit and power supply unit.
Background
In the power management circuit, a power supply loop of a power chip is in a power-on or power-off process, if the transient response speed of the power supply loop is too slow, the power chip may work in an under-voltage state for a period of time in the power-on or power-off process, which may cause the power chip to have a risk of working abnormality or power-on failure, and if the transient response speed of the power supply loop is too fast, a power supply input end of the power chip may generate a peak voltage, which may cause the power chip to have a risk of overvoltage breakdown, so that a corresponding over-voltage and under-voltage protection circuit needs to be added in the design of the power supply loop.
In the existing overvoltage and undervoltage protection circuit scheme, the output voltage of a power supply loop is generally collected, a comparator is used for comparing the output voltage of the power supply loop with set overvoltage and undervoltage reference voltages, and when the output voltage of the power supply loop is greater than the set overvoltage reference voltage or less than the set undervoltage reference voltage, the power supply loop of a chip is switched off to protect a power supply chip. In the scheme, in order to provide a stable power supply and a stable comparison reference power supply for the comparator, a corresponding auxiliary power supply loop needs to be additionally designed, so that the complexity of the circuit is increased, and before the reference power supply for comparison is not well established, the circuit of the scheme still has the condition of misjudgment, so that the system works abnormally.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves needs extra design comparison benchmark circuit and auxiliary circuit power supply circuit among the current mistake, the undervoltage protection circuit scheme, and circuit structure is too complicated.
In order to solve the above technical problem, the utility model discloses a technical scheme that embodiment adopted is: the overvoltage and undervoltage protection circuit comprises an overvoltage protection module, an undervoltage protection module and a power supply control module, wherein the input end of the overvoltage protection module is used for receiving initial voltage, the output end of the overvoltage protection module is connected with the input end of the undervoltage protection module, the output end of the undervoltage protection module is connected with the input end of the power supply control module, the output end of the power supply control module is used for connecting a load, and the input end of the power supply control module is also used for receiving the initial voltage;
the undervoltage protection module is used for conducting when the initial voltage is smaller than an overvoltage threshold and larger than or equal to an undervoltage threshold, and providing a switching signal to the power supply control module based on the initial voltage so as to enable the power supply control module to be conducted;
the power supply control module is used for conducting after receiving the switching signal and supplying power to the load based on the initial voltage;
the undervoltage protection module is further configured to stop providing the switching signal to the power supply control module when the initial voltage is smaller than the undervoltage threshold, so as to turn off the power supply control module;
the overvoltage protection module is used for conducting when the initial voltage is larger than or equal to the overvoltage threshold value, and controlling the undervoltage protection module to be disconnected so as to stop providing the switching signal to the power supply control module and enable the power supply control module to be disconnected.
Optionally, the power supply control module includes: a power supply switch Q2, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2,
the input of power supply switch Q2 is connected the input of overvoltage protection module to receive initial voltage, power supply switch Q2's input passes through resistance R5 connects the first end of electric capacity C2, the first end of electric capacity C2 passes through resistance R7 connects the first output of undervoltage protection module, the second end of electric capacity C2 is connected the second output of undervoltage protection module, power supply switch Q2's control end passes through resistance R6 connects the first end of electric capacity C2, power supply switch Q2's output is used for connecting the load.
Optionally, the under-voltage protection module includes: the undervoltage starting unit, the undervoltage adjusting unit and the voltage dividing resistance unit are arranged on the circuit board;
the first end of the undervoltage starting unit is connected with the input end of the overvoltage protection module to receive the initial voltage, the second end of the undervoltage starting unit is connected with the first input end of the undervoltage adjusting unit, the first end of the voltage dividing resistance unit is connected with the input end of the overvoltage protection module, the second end of the voltage dividing resistance unit is connected with the second output end of the overvoltage protection module, the second input end of the undervoltage adjusting unit is connected with the third end of the voltage dividing resistance unit, the third end of the voltage dividing resistance unit is connected with the first output end of the overvoltage protection module, the first output end of the undervoltage adjusting unit is connected with the first end of the capacitor C2 through the resistor R7, and the second output end of the undervoltage adjusting unit is connected with the second end of the capacitor C2;
the undervoltage starting unit is used for being switched on when the initial voltage is smaller than the overvoltage threshold and larger than or equal to the undervoltage threshold, and is combined with the voltage dividing resistance unit to control the undervoltage adjusting unit to provide the switching signal to the power supply switch Q2 so as to switch on the power supply switch Q2.
Optionally, the voltage-dividing resistance unit includes a resistor R2 and a resistor R3 connected in series, and the under-voltage adjustment unit includes an optocoupler U2, a switching tube Q1, and a capacitor C1;
the first end of the resistor R2 is connected with the input end of the overvoltage protection module, the second end of the resistor R2 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the second end of the capacitor C2, the first end of the capacitor C1 is connected with the first end of the resistor R3, the second end of the capacitor C1 is connected with the second end of the resistor R3, the first end of the optical coupler U2 is connected with the second end of the undervoltage starting unit, the second end of the optical coupler U2 is connected with the input end of the switch tube Q1, the output end of the switch tube Q1 is connected with the second end of the capacitor C1, the control end of the switch tube Q1 is connected with the first end of the capacitor C1, the third end of the optical coupler U2 is connected with the first end of the resistor R7, and the fourth end of the optical coupler U2 is connected with the second end of the capacitor C1.
Optionally, the under-voltage starting unit includes a resistor R4 and a zener diode ZD2, a cathode of the zener diode ZD2 is connected to the input end of the overvoltage protection module through the resistor R4, and an anode of the zener diode ZD2 is connected to the first end of the optocoupler U2.
Optionally, the overvoltage protection module includes: an overvoltage starting unit and an overvoltage adjusting unit;
the first end of the overvoltage starting unit is used for receiving initial voltage, the second end of the overvoltage starting unit is connected with the first end of the overvoltage adjusting unit, the second end of the overvoltage adjusting unit is grounded, the third end of the overvoltage adjusting unit is connected with the third end of the voltage dividing resistor unit, and the fourth end of the overvoltage adjusting unit is grounded;
the overvoltage starting unit is used for conducting when the initial voltage is larger than or equal to the overvoltage threshold value so as to control the overvoltage regulating unit to conduct, and further control the switching tube Q1 to be disconnected so as to disconnect the power supply switch Q2.
Optionally, the overvoltage adjusting unit includes an optocoupler U1, a first end of the optocoupler U1 is connected to the second end of the overvoltage starting unit, a second end of the optocoupler U1 is grounded, a third end of the optocoupler U1 is connected to the first end of the resistor R3, and a fourth end of the optocoupler U1 is grounded.
Optionally, the overvoltage starting unit includes a resistor R1 and a zener diode ZD1, a cathode of the zener diode ZD1 is connected to the second end of the resistor R4, and an anode of the zener diode ZD2 is connected to the first end of the optocoupler U1.
Optionally, the circuit further comprises a zener diode ZD3 and a zener diode ZD4, and the breakdown voltages of the zener diode ZD3 and the zener diode ZD4 are the same as the breakdown voltage of the zener diode ZD 2;
the cathode of the zener diode ZD3 is connected to the second end of the resistor R2, the anode of the zener diode ZD3 is connected to the first end of the resistor R3, the cathode of the zener diode ZD4 is connected to the second end of the resistor R5, and the anode of the zener diode ZD4 is connected to the first end of the capacitor C1.
In order to solve the above technical problem, the utility model discloses another technical scheme that embodiment adopted is: there is provided a power supply apparatus comprising an over-voltage and under-voltage protection circuit as described above.
Be different from the condition of correlation technique, the utility model provides a cross undervoltage protection circuit and power supply unit, the circuit includes overvoltage protection module, undervoltage protection module and power supply control module, and overvoltage protection module's input is used for receiving initial voltage, and undervoltage protection module's input is connected to overvoltage protection module's output, and power supply control module's input is connected to undervoltage protection module's output, and power supply control module's output is used for connecting the load, and power supply control module's input still is used for receiving initial voltage. The utility model discloses can be based on its circuit structure, follow the power supply circuit of cut-off load in the source when the magnitude of voltage surpasss and predetermine the scope, the overvoltage protection and the undervoltage protection of more effectual realization load need not additionally design the comparison reference circuit in addition and assist electric power supply circuit, and circuit structure is simple, and is with low costs, also the facilitate promotion is used.
Drawings
Fig. 1 is a block diagram of an over-voltage and under-voltage protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an over-voltage and under-voltage protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an overvoltage/undervoltage protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of another overvoltage/undervoltage protection circuit according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the accompanying drawings and specific embodiments. It will be understood that 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 be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless defined otherwise, 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 belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present invention provides an overvoltage/undervoltage protection circuit 10, the circuit includes an overvoltage protection module 11, an undervoltage protection module 12 and a power supply control module 13, an input end of the overvoltage protection module 11 can receive an initial voltage, an output end of the overvoltage protection module 11 is connected to an input end of the undervoltage protection module 12, an output end of the undervoltage protection module 12 is connected to an input end of the power supply control module 13, an output end of the power supply control module can be connected to a load 20, and the input end of the power supply control module can also receive the initial voltage.
Specifically, the under-voltage protection module 12 may be turned on when the initial voltage is less than the over-voltage threshold and greater than or equal to the under-voltage threshold, and provide a switching signal to the power supply control module 13 based on the initial voltage, so as to turn on the power supply control module. The power supply control module 13 may be turned on after receiving the switching signal and supply power to the load based on the initial voltage. The overvoltage threshold is the maximum voltage of a power supply voltage range corresponding to the load when the load works normally, and the undervoltage threshold is the minimum voltage of the power supply voltage range corresponding to the load when the load works normally. The load 20 may be a load circuit or a load device, taking a power chip as the load 20 as an example, assuming that a normal operating voltage range of the power chip is a-b, when the voltage is less than a, the power chip operates in an under-voltage state, when the voltage is greater than or equal to b, the power chip operates in an over-voltage state, a is an under-voltage threshold, and b is an over-voltage threshold. The switching signal is used to control the conduction of the under-voltage protection module 12, and it should be noted that the switching signal is a signal for controlling the conduction of the power supply control module 13, and is only called for convenience and is not limited to the form of the switching signal.
It should be noted that the initial voltage refers to a voltage for supplying power to the load, and the circuit mainly detects whether the initial voltage is greater than or equal to an overvoltage threshold or less than an undervoltage threshold to implement overvoltage and undervoltage protection, wherein the overvoltage threshold is greater than the undervoltage threshold.
The under-voltage protection module 12 may further stop providing the switching signal to the power supply control module 13 when the initial voltage is less than the under-voltage threshold, so as to turn off the power supply control module 13. The overvoltage protection module 11 may be turned on when the initial voltage is greater than or equal to the overvoltage threshold, the overvoltage protection module 11 may control the undervoltage protection module 12 to be turned off after being turned on, and the undervoltage protection module 12 stops providing the switching signal to the power supply control module 13 after being turned off, so that the power supply control module 13 is turned off to stop supplying power to the load.
Referring to fig. 2, the power supply control module includes a power supply switch Q2, a resistor R5, a resistor R6, a resistor R7, and a capacitor C2. Wherein, power supply switch Q2 can be the MOS pipe, for example the P channel MOS pipe that fig. 2 shows, the embodiment of the utility model provides a the circuit mainly is through overvoltage protection module with undervoltage protection module, based on initial voltage's value, controls switching on and the disconnection of power supply switch Q2, and then whether the control is the load power supply.
The input of the supply switch Q2 (shown as pin Q2_ 3) is connected to the input of the over-voltage protection module to receive an initial voltage, which is shown as Vin in fig. 2. The input end of the power supply switch Q2 is connected to the first end of the capacitor C2 through the resistor R5, the first end of the capacitor C2 is connected to the first output end of the under-voltage protection module through the resistor R7, the second end of the capacitor C2 is connected to the second output end of the under-voltage protection module, the control end of the power supply switch Q2 (shown as a pin Q2_1 in the figure) is connected to the first end of the capacitor C2 through the resistor R6, the output end of the power supply switch Q2 (shown as a pin Q2_2 in the figure) can be connected to a load, and the voltage provided to the load is shown as Vout in the figure.
Referring to fig. 3, the under-voltage protection module 12 includes an under-voltage start-up unit 121, an under-voltage regulation unit 122 and a voltage dividing resistance unit 123, as shown in the figure, a first end (referring to a first end of a resistor R2 in the figure) of the voltage dividing resistance unit 123 is connected to an input end of the over-voltage protection module 11, a second end (referring to a second end of a resistor R3 in the figure) of the voltage dividing resistance unit 123 is connected to a second output end of the over-voltage protection module 11, a first end of the under-voltage start-up unit 121 is connected to the input end of the over-voltage protection module 11 to receive the initial voltage, a second end of the under-voltage start-up unit 121 is connected to the first input end of the under-voltage regulation unit 122, a second input end (referring to a first end of a capacitor C1 in the figure) of the voltage dividing resistance unit 123 is connected to a third end (referring to a resistor R2 and a resistor R3 in the figure), the third end of the voltage dividing resistance unit 123 is connected to the first output end of the overvoltage protection module 11, the first output end of the undervoltage adjustment unit 122 is connected to the first end of the capacitor C2 through the resistor R7, and the second output end of the undervoltage adjustment unit 122 is connected to the second end of the capacitor C2.
The under-voltage starting unit 121 may be turned on when the initial voltage is smaller than the over-voltage threshold and greater than or equal to the under-voltage threshold, and in combination with the voltage-dividing resistance unit 123, controls the under-voltage adjusting unit 122 to provide the switching signal to the power supply switch Q2, so as to turn on the power supply switch Q2. When the initial voltage is smaller than the undervoltage threshold, the undervoltage start-up unit 121 is not turned on, and the undervoltage adjustment unit 122 does not provide the switching signal to the power supply switch Q2, so as to ensure that the load does not work in an undervoltage state.
The overvoltage protection module 11 includes an overvoltage starting unit 111 and an overvoltage regulating unit 112, a first end of the overvoltage starting unit 111 can receive an initial voltage, a second end of the overvoltage starting unit 111 is connected to a first end of the overvoltage regulating unit 112, a second end of the overvoltage regulating unit 112 is grounded, shown as GND in the figure, a third end of the overvoltage regulating unit 112 is connected to a third end of the voltage dividing resistance unit 123, and a fourth end of the overvoltage regulating unit 112 is grounded.
The overvoltage starting unit 111 may be turned on when the initial voltage is greater than or equal to the overvoltage threshold to control the overvoltage adjusting unit 112 to be turned on, and when the overvoltage adjusting unit 112 is turned on, the undervoltage adjusting unit 122 may be controlled to be turned off, that is, the undervoltage adjusting unit 122 may not provide the switching signal to the power supply switch Q2, so as to ensure that the load may not operate in an overvoltage state.
Referring to fig. 2 and fig. 3, in the undervoltage protection module 12, the undervoltage start-up unit 121 includes a resistor R4 and a zener diode ZD2, the voltage dividing resistor unit 123 includes a resistor R2 and a resistor R3 connected in series, and the undervoltage adjustment unit 122 includes an optocoupler U2, a switching tube Q1 and a capacitor C1.
Specifically, a first end of the resistor R2 is connected to an input end of the overvoltage protection module 11, a second end of the resistor R2 is connected to a first end of the resistor R3, a second end of the resistor R3 is connected to a second end of the capacitor C2, a first end of the capacitor C1 is connected to a first end of the resistor R3, a second end of the capacitor C1 is connected to a second end of the resistor R3, a first end of the optocoupler U2 (shown as an optocoupler U2_1 pin in the figure) is connected to an anode of the zener diode ZD2, a cathode of the zener diode ZD2 is connected to an input end of the overvoltage protection module through the resistor R4, a second end of the optocoupler U2 (shown as an optocoupler U2_2 pin in the figure) is connected to an input end of the switching tube Q1 (shown as a switching tube Q1_3 pin in the figure), an output end of the switching tube Q1 (shown as a switching tube Q1_ 2) is connected to a second end of the capacitor C1, a control end (denoted as pin Q1_1 in the figure) of the switching tube Q1 is connected to a first end of the capacitor C1, a third end (denoted as pin U2_3 in the figure) of the optocoupler U2 is connected to a first end of the resistor R7, and a fourth end (denoted as pin U2_4 in the figure) of the optocoupler U2 is connected to a second end of the capacitor C1.
In the overvoltage protection module 11, the overvoltage starting unit 111 includes a resistor R1 and a zener diode ZD1, and the overvoltage adjusting unit 112 includes an optocoupler U1.
Specifically, the cathode of the zener diode ZD1 is connected to the power supply port of the initial voltage through the resistor R4, that is, at Vin in the figure, the anode of the zener diode ZD2 is connected to the first end of the optocoupler U1 (shown as the optocoupler U1_1 pin in the figure), the second end of the optocoupler U1 (shown as the optocoupler U1_2 pin in the figure) is grounded, the third end of the optocoupler U1 (shown as the optocoupler U1_3 pin in the figure) is connected to the first end of the resistor R3, and the fourth end of the optocoupler U1 (shown as the optocoupler U1_4 pin in the figure) is grounded.
In the above circuit structure, with reference to fig. 2 or fig. 3, taking a power chip as an example of the load 20, assuming that a normal operating voltage range of the power chip is a-b, a breakdown voltage of the zener diode ZD1 is b, and a breakdown voltage of the zener diode ZD2 is a, that is, the breakdown voltage of the zener diode ZD1 corresponds to an overvoltage threshold, and the breakdown voltage of the zener diode ZD2 corresponds to an undervoltage threshold; in other words, the over-voltage threshold is b and the under-voltage threshold is a.
When the value of the initial voltage Vin is greater than or equal to a and less than b, the switching tube Q1 is in a conducting state, the zener diode ZD1 is not conducting, the overvoltage protection module 11 does not work, the zener diode ZD2 in the undervoltage protection module 12 is broken down to enter a voltage stabilization working state, the optocoupler U2 is conducting, that is, the pin U2_3 and the pin U2_4 are conducting, at this time, the first end of the resistor R7 is equivalent to ground, the resistor R7 is at a low potential, so that the voltage difference between the pin Q2_1 and the pin Q2_3 of the power supply switch reaches a starting voltage, and the power supply switch Q2 is conducting to normally supply power to the power supply chip.
When the value of the initial voltage Vin is smaller than a, the zener diode ZD1 is not turned on, the overvoltage protection module 11 does not work, the zener diode ZD2 in the undervoltage protection module 12 is in an undervoltage cut-off state, and the second optocoupler U2 is turned off, that is, the pin U2_3 and the pin U2_4 are turned off, the potential of the resistor R7 is pulled high at this time, and the power supply switch Q2 is turned off, and the power supply for the power supply chip is stopped, so that undervoltage protection is realized.
When the value of the initial voltage Vin is greater than or equal to b, the zener diode ZD1 is broken down to enter a voltage stabilization working state, the optical coupler U1 starts to work, the potential of the first end of the resistor R3 is pulled down, the pin of the triode Q1_1 is equivalent to ground, the triode Q1 is disconnected, the second optical coupler U2 is further controlled to be disconnected, the potential of the resistor R7 is pulled up, the power supply switch Q2 is disconnected, power supply for the power supply chip is stopped, and overvoltage protection is achieved.
In some other embodiments, referring to fig. 4, the circuit further includes a zener diode ZD3 and a zener diode ZD4, a cathode of the zener diode ZD3 is connected to the second terminal of the resistor R2, an anode of the zener diode ZD3 is connected to the first terminal of the resistor R3, a cathode of the zener diode ZD4 is connected to the second terminal of the resistor R5, and an anode of the zener diode ZD4 is connected to the first terminal of the capacitor C1. Wherein the breakdown voltages of the zener diode ZD3 and the zener diode ZD4 are set to be equal to the breakdown voltage of the zener diode ZD 2.
When the value of the initial voltage Vin is less than a, the zener diode ZD3 and the zener diode ZD4 are not broken down, at this time, the branch of the resistor R2 and the resistor R3 are not conducted to form a loop, and the branch of the resistor R5 and the branch of the resistor R7 are not conducted to form a loop, that is, the arrangement of the zener diode ZD3 and the zener diode ZD4 greatly reduces the energy loss of the resistors under the condition of undervoltage. It can be understood that the embodiments of the present invention are not limited to the above-mentioned cases, and also include the case where only the zener diode ZD3 is provided and the case where only the zener diode ZD4 is provided, both of these cases can be reasonably derived from the above-mentioned embodiments, and they do not require extra creative work, so these two cases also belong to the protection scope of the embodiments of the present invention.
The embodiment of the utility model provides a circuit structure through undervoltage protection module and overvoltage protection module sets up, can realize the control to the power supply control module, and then control the power supply to the load, moreover, this circuit can break off rapidly under the circumstances of excessive pressure and under-voltage to the power supply of load, more effectual overvoltage protection and the undervoltage protection who realizes the load. Furthermore, the utility model discloses do not need extra design comparison reference circuit and auxiliary electric power supply circuit, reduced the cost and the circuit complexity of circuit.
An embodiment of the utility model provides a power supply unit, power supply unit includes foretell under-voltage protection circuit 10 and power chip of crossing, initial voltage passes through under-voltage protection circuit 10 does power chip supplies power. The power supply device performs power supply protection on the power supply chip through the over-voltage and under-voltage protection circuit 10, so that the power supply chip always works in a normal power supply voltage range, and the condition of under-voltage or over-voltage is avoided.
The embodiment of the utility model provides a circuit structure through undervoltage protection module and overvoltage protection module sets up, can realize the control to the power supply control module, and then control the power supply to the load, moreover, this circuit can break off rapidly under the circumstances of excessive pressure and under-voltage to the power supply of load, more effectual overvoltage protection and the undervoltage protection who realizes the load. Furthermore, the utility model discloses do not need extra design comparison reference circuit and auxiliary electric power supply circuit, reduced the cost and the circuit complexity of circuit.
It should be noted that the preferred embodiments of the present invention are described in the specification and the drawings, but the present invention can be realized in many different forms, and is not limited to the embodiments described in the specification, and these embodiments are not provided as additional limitations to the present invention, and are provided for the purpose of making the understanding of the disclosure of the present invention more thorough and complete. Moreover, the above technical features are combined with each other to form various embodiments which are not listed above, and all the embodiments are regarded as the scope of the present invention; further, modifications and variations may be suggested to those skilled in the art in light of the above teachings, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (10)
1. An overvoltage and undervoltage protection circuit is characterized by comprising an overvoltage protection module, an undervoltage protection module and a power supply control module, wherein the input end of the overvoltage protection module is used for receiving initial voltage, the output end of the overvoltage protection module is connected with the input end of the undervoltage protection module, the output end of the undervoltage protection module is connected with the input end of the power supply control module, the output end of the power supply control module is used for connecting a load, and the input end of the power supply control module is also used for receiving the initial voltage;
the undervoltage protection module is used for conducting when the initial voltage is smaller than an overvoltage threshold and larger than or equal to an undervoltage threshold, and providing a switching signal to the power supply control module based on the initial voltage so as to enable the power supply control module to be conducted;
the power supply control module is used for conducting after receiving the switching signal and supplying power to the load based on the initial voltage;
the undervoltage protection module is also used for stopping providing the switching signal to the power supply control module when the initial voltage is smaller than the undervoltage threshold value so as to switch off the power supply control module;
the overvoltage protection module is used for conducting when the initial voltage is larger than or equal to the overvoltage threshold value, and controlling the undervoltage protection module to be disconnected so as to stop providing the switching signal to the power supply control module and enable the power supply control module to be disconnected.
2. The undervoltage protection circuit of claim 1, wherein the power control module comprises: a power supply switch Q2, a resistor R5, a resistor R6, a resistor R7 and a capacitor C2,
the input of power supply switch Q2 is connected the input of overvoltage protection module to receive initial voltage, power supply switch Q2's input passes through resistance R5 connects the first end of electric capacity C2, the first end of electric capacity C2 passes through resistance R7 connects the first output of undervoltage protection module, the second end of electric capacity C2 is connected the second output of undervoltage protection module, power supply switch Q2's control end passes through resistance R6 connects the first end of electric capacity C2, power supply switch Q2's output is used for connecting the load.
3. The undervoltage protection circuit of claim 2, wherein the undervoltage protection module comprises: the undervoltage starting unit, the undervoltage adjusting unit and the voltage dividing resistance unit are arranged on the circuit board;
the first end of the undervoltage starting unit is connected with the input end of the overvoltage protection module to receive the initial voltage, the second end of the undervoltage starting unit is connected with the first input end of the undervoltage adjusting unit, the first end of the voltage dividing resistance unit is connected with the input end of the overvoltage protection module, the second end of the voltage dividing resistance unit is connected with the second output end of the overvoltage protection module, the second input end of the undervoltage adjusting unit is connected with the third end of the voltage dividing resistance unit, the third end of the voltage dividing resistance unit is connected with the first output end of the overvoltage protection module, the first output end of the undervoltage adjusting unit is connected with the first end of the capacitor C2 through the resistor R7, and the second output end of the undervoltage adjusting unit is connected with the second end of the capacitor C2;
the undervoltage starting unit is used for being switched on when the initial voltage is smaller than the overvoltage threshold and larger than or equal to the undervoltage threshold, and is combined with the voltage dividing resistance unit to control the undervoltage adjusting unit to provide the switching signal to the power supply switch Q2 so as to switch on the power supply switch Q2.
4. The over-voltage and under-voltage protection circuit of claim 3, wherein the voltage dividing resistance unit comprises a resistor R2 and a resistor R3 which are connected in series, and the under-voltage regulation unit comprises an optocoupler U2, a switching tube Q1 and a capacitor C1;
the first end of the resistor R2 is connected with the input end of the overvoltage protection module, the second end of the resistor R2 is connected with the first end of the resistor R3, the second end of the resistor R3 is connected with the second end of the capacitor C2, the first end of the capacitor C1 is connected with the first end of the resistor R3, the second end of the capacitor C1 is connected with the second end of the resistor R3, the first end of the optical coupler U2 is connected with the second end of the undervoltage starting unit, the second end of the optical coupler U2 is connected with the input end of the switch tube Q1, the output end of the switch tube Q1 is connected with the second end of the capacitor C1, the control end of the switch tube Q1 is connected with the first end of the capacitor C1, the third end of the optical coupler U2 is connected with the first end of the resistor R7, and the fourth end of the optical coupler U2 is connected with the second end of the capacitor C1.
5. The overvoltage and undervoltage protection circuit according to claim 4, wherein the undervoltage start-up unit comprises a resistor R4 and a zener diode ZD2, a cathode of the zener diode ZD2 is connected to the input terminal of the overvoltage protection module through the resistor R4, and an anode of the zener diode ZD2 is connected to the first terminal of the optocoupler U2.
6. The over-voltage and under-voltage protection circuit according to claim 5, wherein the over-voltage protection module comprises: an overvoltage starting unit and an overvoltage adjusting unit;
the first end of the overvoltage starting unit is used for receiving initial voltage, the second end of the overvoltage starting unit is connected with the first end of the overvoltage adjusting unit, the second end of the overvoltage adjusting unit is grounded, the third end of the overvoltage adjusting unit is connected with the third end of the voltage dividing resistor unit, and the fourth end of the overvoltage adjusting unit is grounded;
the overvoltage starting unit is used for conducting when the initial voltage is larger than or equal to the overvoltage threshold value so as to control the overvoltage regulating unit to conduct and further control the switch tube Q1 to be disconnected, so that the power supply switch Q2 is disconnected.
7. The overvoltage-undervoltage protection circuit according to claim 6, wherein the overvoltage regulating unit comprises an optocoupler U1, a first terminal of the optocoupler U1 is connected to the second terminal of the overvoltage starting unit, a second terminal of the optocoupler U1 is grounded, a third terminal of the optocoupler U1 is connected to the first terminal of the resistor R3, and a fourth terminal of the optocoupler U1 is grounded.
8. The overvoltage and undervoltage protection circuit according to claim 7, wherein the overvoltage starting unit comprises a resistor R1 and a zener diode ZD1, a cathode of the zener diode ZD1 is connected to a second end of the resistor R4, and an anode of the zener diode ZD2 is connected to a first end of the optocoupler U1.
9. The over-voltage and under-voltage protection circuit according to claim 8, wherein the circuit further comprises a zener diode ZD3 and a zener diode ZD4, and the breakdown voltages of the zener diode ZD3 and the zener diode ZD4 are the same as the breakdown voltage of the zener diode ZD 2;
the cathode of the zener diode ZD3 is connected to the second end of the resistor R2, the anode of the zener diode ZD3 is connected to the first end of the resistor R3, the cathode of the zener diode ZD4 is connected to the second end of the resistor R5, and the anode of the zener diode ZD4 is connected to the first end of the capacitor C1.
10. A power supply device characterized in that it comprises an overvoltage and undervoltage protection circuit according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220646842.4U CN217087492U (en) | 2022-03-23 | 2022-03-23 | Over-voltage and under-voltage protection circuit and power supply equipment |
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| CN202220646842.4U CN217087492U (en) | 2022-03-23 | 2022-03-23 | Over-voltage and under-voltage protection circuit and power supply equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117498662A (en) * | 2023-12-27 | 2024-02-02 | 深圳市德兰明海新能源股份有限公司 | Switching tube driving circuit and energy storage power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117498662A (en) * | 2023-12-27 | 2024-02-02 | 深圳市德兰明海新能源股份有限公司 | Switching tube driving circuit and energy storage power supply |
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Address after: 518000 19th floor, building 1, kaidar group center building, No. 168, Tongsha Road, Xinwei community, Xili street, Nanshan District, Shenzhen, Guangdong Patentee after: Shenzhen Delian Minghai New Energy Co.,Ltd. Address before: 518000 19th floor, building 1, kaidar group center building, 168 Tongsha Road, Xili street, Nanshan District, Shenzhen, Guangdong Patentee before: Shenzhen Poweroak Newener Co.,Ltd. |