Voltage detection control circuit

Abstract

The utility model discloses a voltage detection control circuit, which relates to the technical field of voltage detection control, and comprises a power supply module for supplying power; the transmission control module is used for controlling the transmission state of the electric energy; the voltage regulation module is used for voltage stabilization regulation and power supply for the load module; the voltage feedback control module is used for sampling voltage, providing a feedback signal for the voltage regulation module, and carrying out self-locking processing and regulating the voltage value of the feedback signal; the load module is used for accessing load equipment; the first voltage detection module is used for overvoltage detection in a first stage; the second voltage detection module is used for overvoltage detection of a second stage; the protection control module is used for controlling the transmission control module to be powered off when the voltage feedback control module works in a self-locking mode and overvoltage of the first stage occurs. The voltage detection control circuit can automatically adjust the feedback signal so as to meet the power supply requirement again, improve the power supply efficiency, enlarge the applicable range of the circuit, and cut off power in the second stage of high voltage.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage detection control, in particular to a voltage detection control circuit. Background Art

[0002] In a DC power supply system, due to the influence of the use environment and the load resistance itself, the DC power supply voltage and output power may fail to meet the requirements of the load equipment, resulting in the load equipment being unable to operate normally. To improve power supply efficiency, most existing DC power supply systems use a DC-DC regulator, which can achieve DC-DC voltage regulation based on the feedback voltage and perform power-off protection when overvoltage occurs. However, when the overvoltage is small and the overvoltage time is short, it is impossible to further adjust the feedback signal value and then further adjust the voltage value of the DC-DC regulator, which makes the DC-DC regulator have a small scope of application and low working efficiency, and thus needs to be improved. Utility Model Content

[0003] The embodiment of the utility model provides a voltage detection control circuit to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A voltage detection control circuit comprises: a power supply module, a transmission control module, a voltage regulation module, a voltage feedback control module, a load module, a first voltage detection module, a second voltage detection module and a protection control module;

[0006] A power module, used to access DC power;

[0007] A transmission control module, connected to the power module, the voltage regulation module, the second voltage detection module and the protection control module, for transmitting the DC power connected to the power module to the voltage regulation module, for receiving the third control signal output by the second voltage detection module and the fourth control signal output by the protection control module and stopping the transmission of power;

[0008] A voltage regulation module, connected to the voltage feedback control module, for receiving the feedback signal output by the voltage feedback control module and performing DC-DC regulation processing on the input electric energy;

[0009] A voltage feedback control module, connected to the first voltage detection module, for sampling the voltage of the electric energy output by the voltage regulation module and outputting a feedback signal, for performing self-locking processing on the first control signal output by the first voltage detection module and outputting a second control signal and adjusting the voltage value of the feedback signal;

[0010] A load module, connected to the voltage regulating module, for receiving the electric energy output by the voltage regulating module and connecting to a load device;

[0011] A first voltage detection module, used to set a first voltage threshold and output a first control signal when the feedback signal is greater than the first voltage threshold;

[0012] A second voltage detection module, connected to the voltage feedback control module, configured to set a second voltage threshold and output a third control signal when the feedback signal is greater than the second voltage threshold;

[0013] The protection control module is connected to the voltage feedback control module and the first voltage detection module, and is used to output a fourth control signal and control the power-off protection work of the transmission control module when the voltage feedback control module self-locks and outputs the second control signal and the first voltage detection module outputs the first control signal.

[0014] As a further solution of the utility model: the power module includes a power interface; the transmission control module includes a first resistor, a first power tube and a first switch tube;

[0015] Preferably, the first end of the power supply interface is connected to the drain of the first power tube and is connected to the gate of the first power tube and the collector of the first switching tube through a first resistor, the emitter of the first switching tube and the second end of the power supply interface are both grounded, the base of the first switching tube is connected to the protection control module and the second voltage detection module, and the source of the first power tube is connected to the voltage regulation module.

[0016] As a further solution of the utility model: the voltage regulation module includes a first capacitor and a first voltage regulator; the load module includes a load interface;

[0017] Preferably, one end of the first capacitor is connected to the source of the first power tube and the VCC end of the first voltage regulator, the other end of the first capacitor, the GND end of the first voltage regulator and one end of the load interface are all grounded, the OUT end of the first voltage regulator is connected to the other end of the load interface, and the FB end of the first voltage regulator is connected to the voltage feedback control module.

[0018] As a further solution of the utility model: the voltage feedback control module includes a second resistor, a third resistor, a fourth resistor, a second switch tube and a signal self-locking device;

[0019] Preferably, one end of the second resistor is connected to one end of the fourth resistor and the OUT end of the first voltage regulator, the other end of the second resistor is connected to the emitter of the second switching tube and the FB end of the first voltage regulator and is grounded through the third resistor, the collector of the second switching tube is connected to the other end of the fourth resistor, the base of the second switching tube is connected to the output end of the signal self-locking device and the protection control module, and the input end of the signal self-locking device is connected to the first voltage detection module.

[0020] As a further solution of the utility model: the first voltage detection module includes a first comparator and a first threshold device; the second voltage detection module includes a second comparator, a second threshold device and a first diode;

[0021] Preferably, the non-inverting end of the first comparator is connected to the non-inverting end of the second comparator and the collector of the second switch tube, the inverting end of the first comparator is connected to the first threshold device, the inverting end of the second comparator is connected to the second threshold device, the output end of the first comparator is connected to the input end of the protection control module and the signal self-locking device, the output end of the second comparator is connected to the anode of the first diode, and the cathode of the first diode is connected to the base of the first switch tube.

[0022] As a further solution of the utility model: the protection control module includes a first logic chip and a second diode;

[0023] Preferably, the first end and the second end of the first logic chip are respectively connected to the output end of the signal self-locking device and the output end of the first comparator, the third end of the first logic chip is connected to the anode of the second diode, and the cathode of the second diode is connected to the base of the first switch tube.

[0024] Compared with the prior art, the beneficial effects of the utility model are as follows: the voltage detection control circuit of the utility model is composed of a voltage regulation module cooperating with a voltage feedback control module to perform DC-DC voltage regulation processing on the electric energy transmitted by the transmission control module, and the first voltage detection module performs the first stage of overvoltage detection and when overvoltage occurs, adjusts the feedback value of the feedback control module, and then the voltage regulation module further performs voltage reduction processing to meet the power supply demand again, improve the power supply efficiency, and increase the applicability of the circuit. If the first voltage detection module still detects overvoltage or the second voltage detection module directly detects overvoltage in the second stage, the transmission control module directly performs power-off protection to improve the safety of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The present invention provides a schematic block diagram of a voltage detection control circuit.

[0027] Figure 2 A circuit diagram of a voltage detection control circuit provided by an example of the utility model.

[0028] Figure 3 This is a connection circuit diagram of the protection control module provided by the example of the utility model. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In one embodiment, see Figure 1 , a voltage detection control circuit, comprising: a power supply module 1, a transmission control module 2, a voltage regulation module 3, a voltage feedback control module 4, a load module 5, a first voltage detection module 6, a second voltage detection module 7 and a protection control module 8;

[0031] Specifically, the power module 1 is used to access DC power;

[0032] The transmission control module 2 is connected to the power module 1, the voltage regulation module 3, the second voltage detection module 7 and the protection control module 8, and is used to transmit the DC power connected to the power module 1 to the voltage regulation module 3, and is used to receive the third control signal output by the second voltage detection module 7 and the fourth control signal output by the protection control module 8 and stop the transmission of power;

[0033] A voltage regulating module 3 is connected to the voltage feedback control module 4 and is used to receive the feedback signal output by the voltage feedback control module 4 and perform DC-DC regulation processing on the input electric energy;

[0034] A voltage feedback control module 4, connected to the first voltage detection module 6, for sampling the voltage of the electric energy output by the voltage regulation module 3 and outputting a feedback signal, for performing a self-locking process on the first control signal output by the first voltage detection module 6 and outputting a second control signal and adjusting the voltage value of the feedback signal;

[0035] A load module 5, connected to the voltage regulating module 3, for receiving the electric energy output by the voltage regulating module 3 and connecting to a load device;

[0036] A first voltage detection module 6, used to set a first voltage threshold and output a first control signal when the feedback signal is greater than the first voltage threshold;

[0037] A second voltage detection module 7, connected to the voltage feedback control module 4, for setting a second voltage threshold and outputting a third control signal when the feedback signal is greater than the second voltage threshold;

[0038] The protection control module 8 is connected to the voltage feedback control module 4 and the first voltage detection module 6, and is used to output a fourth control signal and control the power-off protection work of the transmission control module 2 when the voltage feedback control module 4 self-locks and outputs the second control signal and the first voltage detection module 6 outputs the first control signal.

[0039] In a specific embodiment, the power supply module 1 can adopt a power supply circuit composed of a power supply interface to access direct current power; the transmission control module 2 can adopt a transmission control circuit composed of a power tube, a triode, etc. to control the transmission and cutoff of power; the voltage regulation module 3 can adopt a voltage regulation circuit composed of a DC-DC regulation device, etc., and perform DC-DC voltage regulation on the input power according to the feedback signal output by the voltage feedback control module 4; the voltage feedback control module 4 can adopt a voltage feedback control circuit composed of a resistor, a triode, etc. to sample the voltage of the power output by the voltage regulation module 3 and output a feedback signal, and the voltage value of the feedback signal is adjusted by the first voltage detection module 6; the load module 5 can adopt Use a load interface to connect to a load device; the above-mentioned first voltage detection module 6 can adopt a first voltage detection circuit composed of a comparator, etc., and can set a first voltage threshold value, so as to perform a first-stage overvoltage detection on the feedback signal, and the overvoltage degree is relatively small at this time; the above-mentioned second voltage detection module 7 can adopt a second voltage detection circuit composed of a comparator, etc., and can set a second voltage threshold value, so as to perform a second-stage overvoltage detection on the feedback signal, and the second voltage threshold value is greater than the first voltage threshold value; the above-mentioned protection control module 8 can adopt a protection control circuit composed of a logic chip and a diode, and can control the power-off protection work of the transmission control module 2 when the first voltage detection module 6 detects the overvoltage in the first stage and the voltage feedback control module 4 adjusts the feedback value.

[0040] In another embodiment, see Figure 1 , Figure 2 and Figure 3 , the power module 1 includes a power interface; the transmission control module 2 includes a first resistor R1, a first power tube Q1 and a first switch tube VT1;

[0041] Specifically, the first end of the power interface is connected to the drain of the first power tube Q1 and to the gate of the first power tube Q1 and the collector of the first switch tube VT1 through the first resistor R1, the emitter of the first switch tube VT1 and the second end of the power interface are both grounded, the base of the first switch tube VT1 is connected to the protection control module 8 and the second voltage detection module 7, and the source of the first power tube Q1 is connected to the voltage regulation module 3.

[0042] In a specific embodiment, the first power tube Q1 can be an N-channel field effect tube, which is triggered to turn on by the first resistor R1 and turned off by the first switch tube VT1, wherein the first switch tube VT1 can be an NPN transistor.

[0043] Further, the voltage regulating module 3 includes a first capacitor C1 and a first voltage regulator U1; the load module 5 includes a load interface;

[0044] Specifically, one end of the first capacitor C1 is connected to the source of the first power tube Q1 and the VCC end of the first voltage regulator U1, the other end of the first capacitor C1, the GND end of the first voltage regulator U1 and one end of the load interface are all grounded, the OUT end of the first voltage regulator U1 is connected to the other end of the load interface, and the FB end of the first voltage regulator U1 is connected to the voltage feedback control module 4.

[0045] In a specific embodiment, the first voltage regulator U1 may adopt a DC-DC voltage regulator, and the specific model is not limited. The output voltage value may be adjusted according to the feedback signal received by the FB terminal, ie, the voltage feedback terminal, of the first voltage regulator U1.

[0046] Furthermore, the voltage feedback control module 4 includes a second resistor R2, a third resistor R3, a fourth resistor R4, a second switch tube VT2 and a signal self-locking device;

[0047] Specifically, one end of the second resistor R2 is connected to one end of the fourth resistor R4 and the OUT end of the first voltage regulator U1, the other end of the second resistor R2 is connected to the emitter of the second switch tube VT2 and the FB end of the first voltage regulator U1 and is grounded through the third resistor R3, the collector of the second switch tube VT2 is connected to the other end of the fourth resistor R4, the base of the second switch tube VT2 is connected to the output end of the signal self-locking device and the protection control module 8, and the input end of the signal self-locking device is connected to the first voltage detection module 6.

[0048] In a specific embodiment, the above-mentioned signal self-locking device can be composed of a transistor and a resistor, which can perform self-locking processing on the input high-level signal and output a high-level signal; the above-mentioned second resistor R2 and the third resistor R3 perform voltage sampling, and the second switch tube VT2 and the fourth resistor R4 adjust the feedback signal value, thereby causing the first voltage regulator U1 to reduce the output electric energy, wherein the second switch tube VT2 can select an NPN-type transistor.

[0049] Further, the first voltage detection module 6 includes a first comparator A1 and a first threshold device; the second voltage detection module 7 includes a second comparator A2, a second threshold device and a first diode D1;

[0050] Specifically, the non-inverting end of the first comparator A1 is connected to the non-inverting end of the second comparator A2 and the collector of the second switch tube VT2, the inverting end of the first comparator A1 is connected to the first threshold device, the inverting end of the second comparator A2 is connected to the second threshold device, the output end of the first comparator A1 is connected to the input end of the protection control module 8 and the signal self-locking device, the output end of the second comparator A2 is connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the base of the first switch tube VT1.

[0051] In a specific embodiment, the first comparator A1 and the second comparator A2 can both be LM358 comparators; the first threshold device and the second threshold device can both be composed of a reference power supply and a resistor, and provide a first voltage threshold and a second voltage threshold respectively, wherein the first voltage threshold is an overvoltage reference value for the first stage, and the second voltage threshold is an overvoltage reference value for the second stage, and the first voltage threshold is less than the second voltage threshold.

[0052] Further, the protection control module 8 includes a first logic chip U2 and a second diode D2;

[0053] Specifically, the first and second ends of the first logic chip U2 are respectively connected to the output end of the signal self-locking device and the output end of the first comparator A1, the third end of the first logic chip U2 is connected to the anode of the second diode D2, and the cathode of the second diode D2 is connected to the base of the first switch tube VT1.

[0054] In a specific embodiment, the first logic chip U2 can be an AND gate logic chip.

[0055] In a voltage detection control circuit of the present embodiment, direct current power is connected to the power interface and transmitted to the first voltage regulator U1 by the first power tube Q1. The first voltage regulator U1 performs DC-DC voltage regulation and provides power to the load device connected to the load interface. At the same time, the second resistor R2 and the third resistor R3 perform voltage sampling to provide a feedback signal for the first voltage regulator U1, and the first voltage regulator U1 performs DC-DC voltage regulation. When the feedback signal sampled by the second resistor R2 and the third resistor R3 is greater than the first voltage threshold provided by the first threshold device, the first comparator A1 will output a high level, and the signal is automatically The locking device is self-locking, controlling the second switch tube VT2 to turn on, and cooperating with the fourth resistor R4 to adjust the voltage value of the feedback signal so that the first voltage regulator U1 can perform voltage reduction processing. If the sampled feedback signal is still greater than the first voltage threshold at this time, the third end of the first logic chip U2 will output a high level to control the first switch tube VT1 to turn on, and then control the first power tube Q1 to turn off. If the feedback signal sampled by the second resistor R2 and the third resistor R3 is greater than the second voltage threshold provided by the second threshold device at the beginning, the second comparator A2 will directly control the first switch tube VT1 to turn on, and control the first power tube Q1 to turn off, and perform power-off protection.

[0056] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A voltage detection control circuit, characterized in that: The voltage detection control circuit comprises: a power supply module, a transmission control module, a voltage regulation module, a voltage feedback control module, a load module, a first voltage detection module, a second voltage detection module and a protection control module; The power module is used to access direct current power; The transmission control module is connected to the power module, the voltage regulation module, the second voltage detection module and the protection control module, and is used to transmit the DC power connected to the power module to the voltage regulation module, and is used to receive the third control signal output by the second voltage detection module and the fourth control signal output by the protection control module and stop the transmission of power; The voltage regulation module is connected to the voltage feedback control module and is used to receive the feedback signal output by the voltage feedback control module and perform DC-DC regulation processing on the input electric energy; The voltage feedback control module is connected to the first voltage detection module, and is used to perform voltage sampling on the electric energy output by the voltage regulation module and output a feedback signal, and is used to perform self-locking processing on the first control signal output by the first voltage detection module and output a second control signal and adjust the voltage value of the feedback signal; The load module is connected to the voltage regulating module and is used to receive the electric energy output by the voltage regulating module and connect to the load device; The first voltage detection module is used to set a first voltage threshold and output a first control signal when the feedback signal is greater than the first voltage threshold; The second voltage detection module is connected to the voltage feedback control module, and is used to set a second voltage threshold and output a third control signal when the feedback signal is greater than the second voltage threshold; The protection control module is connected to the voltage feedback control module and the first voltage detection module, and is used to output a fourth control signal and control the power-off protection work of the transmission control module when the voltage feedback control module self-locks and outputs the second control signal and the first voltage detection module outputs the first control signal.

2. A voltage detection control circuit according to claim 1, characterized in that: The power supply module includes a power supply interface; the transmission control module includes a first resistor, a first power tube and a first switch tube; The first end of the power interface is connected to the drain of the first power tube and is connected to the gate of the first power tube and the collector of the first switch tube through a first resistor. The emitter of the first switch tube and the second end of the power interface are both grounded. The base of the first switch tube is connected to the protection control module and the second voltage detection module. The source of the first power tube is connected to the voltage regulation module.

3. A voltage detection control circuit according to claim 2, characterized in that: The voltage regulation module includes a first capacitor and a first voltage regulator; the load module includes a load interface; One end of the first capacitor is connected to the source of the first power tube and the VCC end of the first voltage regulator, the other end of the first capacitor, the GND end of the first voltage regulator and one end of the load interface are all grounded, the OUT end of the first voltage regulator is connected to the other end of the load interface, and the FB end of the first voltage regulator is connected to the voltage feedback control module.

4. A voltage detection control circuit according to claim 3, characterized in that: The voltage feedback control module includes a second resistor, a third resistor, a fourth resistor, a second switch tube and a signal self-locking device; One end of the second resistor is connected to one end of the fourth resistor and the OUT end of the first voltage regulator, the other end of the second resistor is connected to the emitter of the second switch tube and the FB end of the first voltage regulator and is grounded through the third resistor, the collector of the second switch tube is connected to the other end of the fourth resistor, the base of the second switch tube is connected to the output end of the signal self-locking device and the protection control module, and the input end of the signal self-locking device is connected to the first voltage detection module.

5. A voltage detection control circuit according to claim 4, characterized in that: The first voltage detection module includes a first comparator and a first threshold device; the second voltage detection module includes a second comparator, a second threshold device and a first diode; The non-inverting end of the first comparator is connected to the non-inverting end of the second comparator and the collector of the second switch tube, the inverting end of the first comparator is connected to the first threshold device, the inverting end of the second comparator is connected to the second threshold device, the output end of the first comparator is connected to the input end of the protection control module and the signal self-locking device, the output end of the second comparator is connected to the anode of the first diode, and the cathode of the first diode is connected to the base of the first switch tube.

6. A voltage detection control circuit according to claim 5, characterized in that: The protection control module includes a first logic chip and a second diode; The first end and the second end of the first logic chip are respectively connected to the output end of the signal self-locking device and the output end of the first comparator, the third end of the first logic chip is connected to the anode of the second diode, and the cathode of the second diode is connected to the base of the first switch tube.

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