Drive circuit of relay and energy storage inverter

Abstract

The invention relates to the technical field of relays, and discloses a relay driving circuit and an energy storage inverter, and the circuit comprises a power switching unit which is connected with a first power supply, is used for accessing a power switching signal, and outputs the power voltage of the first power supply as a first voltage when the power switching signal is a turn-on level; the voltage-multiplying unit is connected with the power supply switching unit and the first power supply, and is used for accessing a voltage-multiplying control signal and outputting a second voltage based on the power supply voltage and the first voltage when the voltage-multiplying control signal is a turn-on level, and the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power supply voltage; and the relay driving unit is connected with the power supply switching unit, the voltage doubling unit and a coil of the relay to be driven, and is used for accessing a relay driving signal and driving the relay to be driven based on the second voltage when the relay driving signal is a turn-on level. The driving efficiency of the relay is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of relays, in particular to a driving circuit of a relay and an energy storage inverter. BACKGROUND

[0002] With the increasing use of relays in various fields, users have higher requirements for the driving mode of relays.

[0003] The traditional driving mode of a relay is to apply a fixed voltage (i.e. the first voltage of a unique power source connected) to both ends of the relay coil, and finally generate an electromagnetic effect to control the relay switch. This driving method of the relay has great defects, and there may be a phenomenon that the relay closing time is too long due to the fixed voltage (the closing time is longer when the voltage is lower). That is, the driving mode of the relay will cause the relay closing time to be too long due to the fixed voltage, thereby causing low driving efficiency of the relay.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide a driving circuit of a relay and an energy storage inverter, aiming at solving the problem of low driving efficiency of the relay.

[0006] To achieve the above-mentioned purpose, the present application provides a driving circuit of a relay, which comprises:

[0007] A power switching unit, the input end of the power switching unit is connected with a first power source, the power switching unit is used for accessing a power switching signal, and outputs a power voltage of the first power source as a first voltage when the power switching signal is an open level;

[0008] A voltage doubling unit, the input end of the voltage doubling unit is connected with the power switching unit and the first power source, the voltage doubling unit is used for accessing a voltage doubling control signal, and outputs a second voltage based on the power voltage and the first voltage when the voltage doubling control signal is an open level, wherein the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power voltage;

[0009] A relay driving unit, the input end of the relay driving unit is connected with the output end of the power switching unit and the output end of the voltage doubling unit, the output end of the relay driving unit is connected with the coil of a relay to be driven, and the relay driving unit is used for accessing a relay driving signal, and drives the relay to be driven based on the second voltage when the relay driving signal is an open level.

[0010] In an embodiment, the driving circuit of the relay further comprises:

[0011] a second power supply connected with the input end of the relay driving unit, the output end of the power switching unit and the output end of the voltage doubling unit;

[0012] the power switching unit is further configured to output a third voltage of the second power supply to drive the relay to be driven when the power switching signal is at the off level, wherein the third voltage has a value of half of the first voltage.

[0013] In an embodiment, the control end of the voltage doubling unit is connected with the control end of the relay driving unit, wherein the voltage doubling control signal is the same as the relay driving signal.

[0014] In an embodiment, the voltage doubling unit comprises:

[0015] a third power supply connected with the input end of the power switching unit, wherein the voltage value of the third power supply is equal to the voltage value of the first voltage.

[0016] In an embodiment, the power switching unit comprises a first power switching sub-circuit and a second power switching sub-circuit, the first power switching sub-circuit is connected with the input end of the voltage doubling unit, the second power switching sub-circuit, the first power supply and the input end of the relay driving unit, the second power switching sub-circuit is connected with the input end of the relay driving unit, and the first power switching sub-circuit comprises:

[0017] a first resistor, a first end of the first resistor being connected with the power switching signal;

[0018] a first capacitor, a second end of the first capacitor being connected with a second end of the first resistor, and a first end of the first capacitor being grounded;

[0019] a second resistor, a second end of the second resistor being connected with the second end of the first resistor, and a first end of the second resistor being grounded;

[0020] a first switch tube, a gate of the first switch tube being connected with the second end of the first resistor, and a source of the first switch tube being grounded;

[0021] a third resistor, a first end of the third resistor being connected with a drain of the first switch tube;

[0022] a fourth resistor, a first end of the fourth resistor being connected with a second end of the third resistor;

[0023] a first transistor, a base of the first transistor is connected with the second end of the third resistor, an emitter of the first transistor is connected with the second end of the fourth resistor, a collector of the first transistor is connected with the input end of the relay driving unit and the second power supply switching sub-circuit;

[0024] a first diode, an anode of the first diode is connected with the first power supply and the input end of the voltage doubling unit, a cathode of the first diode is connected with the second end of the fourth resistor.

[0025] In an embodiment, the second power supply switching sub-circuit comprises:

[0026] a second capacitor, a second end of the second capacitor is connected with the collector of the first transistor, a first end of the second capacitor is grounded;

[0027] a voltage stabilizing tube, a cathode of the voltage stabilizing tube is connected with the collector of the first transistor, an anode of the voltage stabilizing tube is grounded;

[0028] a second diode, an anode of the second diode is connected with the second power supply in the driving circuit of the relay, a cathode of the second diode is connected with the emitter of the first transistor.

[0029] In an embodiment, the voltage doubling unit comprises a voltage control sub-circuit and a voltage output sub-circuit, the voltage control sub-circuit is connected with the voltage output sub-circuit, the voltage output sub-circuit is connected with the first power supply, the power supply switching unit and the relay driving unit, the voltage control sub-circuit comprises:

[0030] a fifth resistor, a first end of the fifth resistor is connected with the voltage doubling control signal;

[0031] a third capacitor, a second end of the third capacitor is connected with the second end of the fifth resistor, a first end of the third capacitor is grounded;

[0032] a sixth resistor, a second end of the sixth resistor is connected with the second end of the fifth resistor, a first end of the sixth resistor is grounded;

[0033] a second switch tube, a gate of the second switch tube is connected with the second end of the fifth resistor, a source of the second switch tube is grounded, a drain of the second switch tube is connected with the voltage output sub-circuit.

[0034] In an embodiment, the voltage output sub-circuit comprises:

[0035] a seventh resistor, a first end of the seventh resistor is connected with the drain of the second switch tube;

[0036] a seventh resistor, a first end of the seventh resistor being connected with the second end of the sixth resistor;

[0037] a second transistor, a base of the second transistor being connected with the second end of the seventh resistor, an emitter of the second transistor being connected with a second end of the eighth resistor and the first power supply;

[0038] a third diode, an anode of the third diode being connected with a collector of the second transistor, a cathode of the third diode being connected with an input end of the relay driving unit;

[0039] a ninth resistor, a first end of the ninth resistor being grounded;

[0040] a fourth capacitor, a first end of the fourth capacitor being connected with a second end of the ninth resistor, a second end of the fourth capacitor being connected with the cathode of the third diode and a cathode of a first diode in the power supply switching unit.

[0041] In an embodiment, the relay driving unit comprises a driving control sub-circuit and a driving output sub-circuit, the driving control sub-circuit being connected with the driving output sub-circuit, the driving output sub-circuit being connected with an output end of the power supply switching unit, an output end of the voltage doubling unit and a coil of the relay to be driven, the driving control sub-circuit comprising:

[0042] a tenth resistor, a first end of the tenth resistor being connected with the relay driving signal;

[0043] a fifth capacitor, a second end of the fifth capacitor being connected with a second end of the tenth resistor, a first end of the fifth capacitor being grounded;

[0044] an eleventh resistor, a second end of the eleventh resistor being connected with the second end of the tenth resistor, a first end of the eleventh resistor being grounded;

[0045] a third switch tube, a gate of the third switch tube being connected with the second end of the tenth resistor, a source of the third switch tube being grounded, a drain of the third switch tube being connected with the driving output sub-circuit;

[0046] the driving output sub-circuit comprising:

[0047] a voltage suppression diode, a first end of the voltage suppression diode being connected with the drain of the third switch tube and a first end of the coil of the relay to be driven, a second end of the voltage suppression diode being connected with the output end of the power supply switching unit, the output end of the voltage doubling unit and a second end of the coil of the relay to be driven.

[0048] In addition, the application further provides a storage energy inverter, which comprises a relay to be driven and the relay driving circuit.

[0049] The application provides a relay driving circuit, which comprises a power switching unit, an input end of the power switching unit being connected with a first power supply, the power switching unit being used for accessing a power switching signal and outputting a power supply voltage of the first power supply as a first voltage when the power switching signal is an open level; a voltage doubling unit, an input end of the voltage doubling unit being connected with the power switching unit and the first power supply, the voltage doubling unit being used for accessing a voltage doubling control signal and outputting a second voltage based on the power supply voltage and the first voltage when the voltage doubling control signal is an open level, wherein a voltage value of the second voltage is equal to a sum of a voltage value of the first voltage and a voltage value of the power supply voltage; and a relay driving unit, an input end of the relay driving unit being connected with an output end of the power switching unit and an output end of the voltage doubling unit, an output end of the relay driving unit being connected with a coil of the relay to be driven, the relay driving unit being used for accessing a relay driving signal and driving the relay to be driven based on the second voltage when the relay driving signal is an open level. The power switching unit in the relay driving circuit outputs the power supply voltage of the first power supply as the first voltage based on the power switching signal, the voltage doubling unit further outputs the second voltage based on the voltage doubling control signal, the power supply voltage and the first voltage, wherein the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power supply voltage, and finally the relay driving unit drives the relay to be driven based on the second voltage under the control of the relay driving signal, thereby avoiding the phenomenon that the fixed voltage (the closing time is longer when the voltage is lower) in the prior art causes the longer switching time of the relay. The relay driving circuit provides a new relay driving circuit, and is not the commonly used relay switching based on the fixed voltage. The relay driving unit drives the relay to be driven based on the second voltage under the control of the relay driving signal, wherein the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power supply voltage, so as to supply power to the coil of the relay to be driven by the large voltage, thereby realizing the fast closing of the relay to be driven and improving the driving efficiency of the relay. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 FIG. 1 is a structural schematic diagram of the relay driving circuit of the application;

[0051] Figure 2 FIG. 2 is a connection schematic diagram of the first power switching sub-circuit in the relay driving circuit of the application;

[0052] Figure 3A connection diagram of a second power supply switching sub-circuit in a driving circuit of a relay of the present application;

[0053] Figure 4 A connection diagram of a voltage doubling circuit in a driving circuit of a relay of the present application;

[0054] Figure 5 Another connection diagram of a voltage doubling circuit in a driving circuit of a relay of the present application;

[0055] Figure 6 A connection diagram of a relay driving circuit in a driving circuit of a relay of the present application;

[0056] Figure 7 Another connection diagram of a relay driving circuit in a driving circuit of a relay of the present application;

[0057] Figure 8 A connection diagram of a driving circuit of a relay of the present application;

[0058] Figure 9 Another connection diagram of a driving circuit of a relay of the present application;

[0059] Figure 10 A waveform diagram of a driving circuit of a relay of the present application.

[0060] BRIEF DESCRIPTION OF THE DRAWINGS

[0061] 10, power supply switching unit; 20, voltage doubling unit; 30, relay driving unit; 200, relay to be driven; PC, power supply switching signal; VCC1, first power supply; DP, voltage doubling control signal; RD, relay driving signal; P1-P2, first transistor-second transistor; R1-R11, first resistor-eleventh resistor; C1-C5, first capacitor-fifth capacitor; Q1-Q3, first switch tube-third switch tube; D1-D3, first diode-third diode; VCC2, second power supply; W1, voltage stabilizing tube; TV, voltage suppression diode; L, coil; 11, first power supply switching sub-circuit; 12, second power supply switching sub-circuit; 21, voltage control sub-circuit; 22, voltage output sub-circuit; 31, driving control sub-circuit; 32, driving output sub-circuit.

[0062] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0063] It should be understood that the specific embodiments described herein merely exemplify the application and do not limit the application.

[0064] For better understanding of the technical solutions of the present application, the following will be described in detail in combination with the drawings of the specification and specific embodiments.

[0065] Most of the relays used in the current control circuit are electromagnetic relays, that is, by applying a certain voltage across the relay coil, an electromagnetic effect is ultimately generated to control the relay switch. The electromagnetic relay mostly uses a constant voltage driving method, that is, a fixed voltage is used to drive the relay switch. Although the constant voltage driving method is simple, the relay switch time has large discreteness (that is, different driving times exist for a certain voltage, for example, for a certain voltage A, the relay may be turned on for A seconds, and for B seconds, the relay B is turned on), which can be widely used in occasions without requirements for the switch. However, for occasions with requirements for the relay switch time, on the one hand, the constant voltage driving method cannot be used to accelerate the relay switch and cannot be applied, and on the other hand, the constant voltage driving method cannot reduce the power consumption of the relay during the attraction and holding period, which leads to overheating and affects the service life of the product.

[0066] Therefore, based on the deficiencies of the relay driving circuit, the relay driving method of the present application is proposed. The main solution of the embodiment of the present application is that the power switching unit in the relay driving circuit outputs the power voltage of the first power supply as the first voltage based on the power switching signal, and the further voltage multiplication unit outputs the second voltage based on the voltage multiplication control signal, the power voltage and the first voltage, wherein the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power voltage, and finally the relay driving unit drives the to-be-driven relay based on the second voltage under the control of the relay driving signal, thereby avoiding the phenomenon that the fixed voltage (the closing time is longer when the voltage is lower) in the prior art causes the relay switch time to be longer. This relay driving circuit provides a new relay driving circuit, which is not based on the fixed voltage to control the relay switch. On the other hand, the relay driving unit drives the to-be-driven relay based on the second voltage under the control of the relay driving signal, wherein the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power voltage, so as to supply power to the coil of the to-be-driven relay by using a large voltage, thereby realizing the fast closing of the to-be-driven relay and improving the driving efficiency of the relay.

[0067] The present application provides a relay driving circuit, referring to Figure 1 the structure diagram of the relay driving circuit, the relay driving circuit comprises:

[0068] A power switching unit 10, an input end of the power switching unit 10 is connected with a first power supply VCC1, the power switching unit 10 is used for accessing a power switching signal PC, and when the power switching signal PC is an open level, outputting a power supply voltage of the first power supply VCC1 as a first voltage;

[0069] A voltage doubling unit 20, an input end of the voltage doubling unit 20 is connected with the power switching unit 10 and the first power supply VCC1, the voltage doubling unit 20 is used for accessing a voltage doubling control signal DP, and when the voltage doubling control signal DP is an open level, outputting a second voltage based on the power supply voltage and the first voltage, wherein a voltage value of the second voltage is equal to a value sum between a voltage value of the first voltage and a voltage value of the power supply voltage;

[0070] A relay driving unit 30, an input end of the relay driving unit 30 is connected with an output end of the power switching unit 10 and an output end of the voltage doubling unit 20, an output end of the relay driving unit 30 is connected with a coil L of a to-be-driven relay 200, the relay driving unit 30 is used for accessing a relay driving signal RD, and when the relay driving signal RD is an open level, driving the to-be-driven relay 200 based on the second voltage.

[0071] In the embodiment, in order to improve the driving efficiency of the relay, i.e. to reduce the impact of driving the relay switch with constant voltage all the time. The power switching unit 10 outputs the power voltage of the first power supply VCC1 as the first voltage to the power switching unit 10 under the control of the power switching signal PC, at this time the advantage of the power switching unit 10 being turned on is that it avoids the subsequent direct second voltage being applied to the switch tube, and further damages the switch tube due to the large voltage. The voltage doubling unit 20 outputs the power voltage of the first power supply VCC1 and the first voltage to the coil L of the relay to be driven 200 under the control of the voltage doubling control signal DP at the same time, at this time the voltage value of the second voltage is equal to the sum of the voltage value of the first voltage and the voltage value of the power voltage. Finally, the second voltage is output to the relay driving unit 30, as long as the relay driving signal RD of the relay driving unit 30 controls (if the relay to be driven 200 needs to be turned on at this time), the second voltage is output to the coil L of the relay to be driven 200, at this time the coil L will be driven by the second voltage to turn on the relay to be driven 200 (which means that the internal switch of the relay to be driven 200 is closed, and the relay to be driven 200 starts to work). At this time, the 2V1 (V1 refers to the voltage of the first power supply) voltage drives the relay to be driven 200 to turn on, so that the relay to be driven 200 can be quickly turned on, and the driving efficiency of the relay is improved. It is worth noting that the power switching signal PC, the voltage doubling control signal DP and the relay driving signal RD can be high and low levels, or can be controlled by a high and low level chip. Taking the power switching signal PC as an example, when the power switching unit 10 needs to output the first voltage of the first power supply VCC1, the power switching signal PC can be controlled to be high (i.e. high level as the opening level), at this time the power switching unit 10 is turned on, and the first voltage of the first power supply VCC1 is output; when the power switching unit 10 does not need to output the first voltage of the first power supply VCC1, the power switching signal PC can be controlled to be low, at this time the power switching unit 10 is turned off, and the first power supply VCC1 cannot output.

[0072] The embodiment provides a relay driving circuit, which comprises a power switching unit, an input end of the power switching unit being connected with a first power supply, the power switching unit being used for accessing a power switching signal and outputting a power supply voltage of the first power supply as a first voltage when the power switching signal is an open level; a voltage doubling unit, an input end of the voltage doubling unit being connected with the power switching unit and the first power supply, the voltage doubling unit being used for accessing a voltage doubling control signal and outputting a second voltage based on the power supply voltage and the first voltage when the voltage doubling control signal is an open level, wherein a voltage value of the second voltage is equal to a value sum of a voltage value of the first voltage and a voltage value of the power supply voltage; and a relay driving unit, an input end of the relay driving unit being connected with an output end of the power switching unit and an output end of the voltage doubling unit, an output end of the relay driving unit being connected with a coil of a relay to be driven, the relay driving unit being used for accessing a relay driving signal and driving the relay to be driven based on the second voltage when the relay driving signal is an open level. The power switching unit in the relay driving circuit outputs the power supply voltage of the first power supply as the first voltage based on the power switching signal, the voltage doubling unit outputs the second voltage based on the voltage doubling control signal, the power supply voltage and the first voltage, wherein the voltage value of the second voltage is equal to the value sum of the voltage value of the first voltage and the voltage value of the power supply voltage, and finally the relay driving unit drives the relay to be driven based on the second voltage under the control of the relay driving signal, thereby avoiding the phenomenon that the fixed voltage (the closing time is relatively long when the voltage is relatively low) in the prior art causes the long switching time of the relay. The relay driving circuit provides a new relay driving circuit, and controls the relay switching based on the fixed voltage, and the relay driving unit drives the relay to be driven based on the second voltage under the control of the relay driving signal, wherein the voltage value of the second voltage is equal to the value sum of the voltage value of the first voltage and the voltage value of the power supply voltage, so that the coil of the relay to be driven is supplied with power rapidly by the large voltage, and the fast closing of the relay to be driven can be realized, thereby improving the driving efficiency of the relay.

[0073] Further, in another embodiment of the relay driving circuit, the relay driving circuit further comprises:

[0074] a second power supply VCC2, the second power supply VCC2 being connected with an input end of the relay driving unit 30, an output end of the power switching unit 10 and an output end of the voltage doubling unit 20;

[0075] The power switching unit 10 is also configured to output a third voltage of the second power supply VCC2 to drive the relay to be driven 200 when the power switching signal PC is at the off level, wherein the third voltage has a value of half of the first voltage.

[0076] In the embodiment, after the relay is continuously operated, since the first power supply is the voltage required for turning on the relay, and the subsequent maintenance can be maintained using a smaller voltage to reduce the loss of the coil L, the driving circuit of the relay further comprises a second power supply connected with the input end of the relay driving unit, the output end of the power switching unit and the output end of the voltage doubling unit. When the power switching signal is at the off level, the third voltage of the second power supply is output to drive the relay to be driven, wherein the third voltage has a value of half of the first voltage, that is, the second voltage output from the output end of the voltage doubling unit is turned off at this time, and the second power supply is used to maintain the power supply of the relay to be driven 200, thereby reducing the loss when the relay is continuously turned on. At the same time, when the relay is subsequently turned off, it can be directly reduced to 0 by a lower voltage, so as to reduce the time of turning off, and thereby improve the efficiency of the relay driving.

[0077] Further, in another embodiment of the relay driving circuit of the present application, the control end of the voltage doubling unit is connected with the control end of the relay driving unit, wherein the voltage doubling control signal is the same as the relay driving signal.

[0078] In an embodiment, the voltage doubling unit comprises:

[0079] A third power supply connected with the input end of the power switching unit, wherein the voltage value of the third power supply is equal to the voltage value of the first voltage.

[0080] In the embodiment, it can be known from the function analysis of the above voltage doubling unit 20 that the voltage doubling unit 20 actually realizes the function of outputting a voltage to make the original V1 become 2V1, that is, at this time the voltage doubling unit 20 can directly comprise a third power supply connected with the input end of the power switching unit, wherein the voltage value of the third power supply is equal to the voltage value of the first voltage, at this time 2V1 can be output together with the first power supply VCC1, at this time the first power supply VCC1 can be directly replaced by a fourth power supply having a voltage value twice that of the first power supply VCC1, that is, the fourth power supply can be directly controlled to be turned on or off to realize the output of 2V1. In a feasible embodiment, the control end of the voltage doubling unit is connected with the control end of the relay driving unit, wherein the voltage doubling control signal is the same as the relay driving signal, at this time a control signal can be output to realize the control of the two circuits, so as to reduce the use of the output control signal, and since the voltage doubling output can be controlled at the same time as the relay conduction, the signal output can be saved.

[0081] Further, in another embodiment of the driving circuit of the relay of the present application, referring to Figure 2 , Figure 2 The power switching unit 10 includes a first power switching sub-circuit 11 and a second power switching sub-circuit 12. The first power switching sub-circuit 11 is connected with the input end of the voltage doubling unit 20, the second power switching sub-circuit 12, the first power supply VCC1 and the input end of the relay driving unit 30. The second power switching sub-circuit 12 is connected with the input end of the relay driving unit 30. The first power switching sub-circuit 11 includes:

[0082] a first resistor R1, a first end of the first resistor R1 being connected with the power switching signal PC;

[0083] a first capacitor C1, a second end of the first capacitor C1 being connected with a second end of the first resistor R1, and a first end of the first capacitor C1 being grounded;

[0084] a second resistor R2, a second end of the second resistor R2 being connected with the second end of the first resistor R1, and a first end of the second resistor R2 being grounded;

[0085] a first switch tube Q1, a gate of the first switch tube Q1 being connected with the second end of the first resistor R1, and a source of the first switch tube Q1 being grounded;

[0086] a third resistor R3, a first end of the third resistor R3 being connected with a drain of the first switch tube Q1;

[0087] a fourth resistor R4, a first end of the fourth resistor R4 being connected with a second end of the third resistor R3;

[0088] a first triode P1, a base of the first triode P1 being connected with the second end of the third resistor R3, an emitter of the first triode P1 being connected with a second end of the fourth resistor R4, and a collector of the first triode P1 being connected with the input end of the relay driving unit 30 and the second power switching sub-circuit 12;

[0089] a first diode D1, an anode of the first diode D1 being connected with the first power supply VCC1 and the input end of the voltage doubling unit 20, and a cathode of the first diode D1 being connected with the second end of the fourth resistor R4.

[0090] Specifically, referring to Figure 3 , Figure 3A connection diagram of a second power supply switching sub-circuit in a driving circuit of the relay of the present application, the second power supply switching sub-circuit 12 comprises:

[0091] a second capacitor C2, a second end of the second capacitor C2 is connected with a collector of the first triode P1, and a first end of the second capacitor C2 is grounded;

[0092] a voltage stabilizing tube W1, a cathode of the voltage stabilizing tube W1 is connected with the collector of the first triode P1, and an anode of the voltage stabilizing tube W1 is grounded;

[0093] a second diode D2, an anode of the second diode D2 is connected with a second power supply VCC2 in the driving circuit of the relay, and a cathode of the second diode D2 is connected with an emitter of the first triode P1, wherein a voltage value of the second power supply VCC2 is less than a voltage value of the first power supply VCC1.

[0094] In the embodiment, the power supply switching unit 10 comprises the first power supply switching sub-circuit 11 and the second power supply switching sub-circuit 12, the first power supply switching sub-circuit 11 is connected with an input end of the voltage doubling unit 20, the second power supply switching sub-circuit 12, a power supply switching port, the first power supply VCC1 and an input end of the relay driving unit 30, the first power supply switching sub-circuit 11 functions to control the whole circuit to be turned on at the power supply switching port, for example, when a power supply switching signal PC outputs a high level, a first switch tube Q1 is turned on and then makes a base of the first triode P1 grounded, at this time, the first triode P1 is turned on, so that a first voltage of the first power supply VCC1 can be transmitted to A1, on the contrary, when the power supply switching signal PC outputs a low level, the whole circuit is turned off. The second power supply switching sub-circuit 12 functions to directly output to A2 when the first voltage of the first power supply VCC1 is transmitted to A1, on the contrary, when the first voltage of the first power supply VCC1 is not transmitted to A1 or the voltage at A1 is consumed by the second capacitor C2, the second power supply VCC2 is used to transmit to A2, wherein the voltage value of the second power supply VCC2 is less than the voltage value of the first power supply VCC1, that is, the whole control process is that the first voltage of the first power supply VCC1 is transmitted to A2- consumed by the second capacitor C2- transmitted to A2 by the second power supply VCC2- the driven relay 200 is turned off (refers to the internal switch of the driven relay 200 is turned off, and the driven relay 200 stops working) based on the second power supply VCC2, at this time, the second power supply switching sub-circuit 12 functions to use a lower voltage to maintain working when the driven relay 200 is turned on, so as to reduce the internal power consumption, such as the heat energy generated by the continuous running of the coil L.

[0095] Further, in another embodiment of the driving circuit of the relay of the present application, referring to Figure 4 , Figure 4A connection diagram of a voltage doubling circuit in a driving circuit of a relay of the present application, the voltage doubling unit 20 comprises a voltage control sub-circuit 21 and a voltage output sub-circuit 22, the voltage control sub-circuit 21 is connected with the voltage output sub-circuit 22, the voltage output sub-circuit 22 is connected with the first power supply VCC1, the power supply switching unit 10 and the relay driving unit 30, the voltage control sub-circuit 21 comprises:

[0096] A fifth resistor R5, a first end of the fifth resistor R5 is connected with the voltage doubling control signal DP;

[0097] A third capacitor C3, a second end of the third capacitor C3 is connected with a second end of the fifth resistor R5, a first end of the third capacitor C3 is grounded;

[0098] A sixth resistor R6, a second end of the sixth resistor R6 is connected with the second end of the fifth resistor R5, a first end of the sixth resistor R6 is grounded;

[0099] A second switch tube Q2, a gate of the second switch tube Q2 is connected with the second end of the fifth resistor R5, a source of the second switch tube Q2 is grounded, a drain of the second switch tube Q2 is connected with the voltage output sub-circuit 22.

[0100] Specifically, referring to Figure 5 , Figure 5 Another connection diagram of a voltage doubling circuit in a driving circuit of a relay of the present application, the voltage output sub-circuit 22 comprises:

[0101] A seventh resistor R7, a first end of the seventh resistor R7 is connected with a drain of the second switch tube Q2;

[0102] An eighth resistor R8, a first end of the eighth resistor is connected with a second end of the seventh resistor R7;

[0103] A second triode P2, a base of the second triode P2 is connected with the second end of the seventh resistor R7, an emitter of the second triode P2 is connected with a second end of the eighth resistor R8 and the first power supply VCC1;

[0104] A third diode D3, an anode of the third diode D3 is connected with a collector of the second triode P2, a cathode of the third diode D2 is connected with an input end of the relay driving unit 30;

[0105] A ninth resistor R9, a first end of the ninth resistor R9 is grounded;

[0106] A fourth capacitor C4, a first end of the fourth capacitor C4 is connected with a second end of the ninth resistor R9, a second end of the fourth capacitor C4 is connected with a cathode of the third diode D3 and a cathode of the first diode D1 in the power supply switching unit 10.

[0107] In the embodiment, the voltage doubling unit 20 includes a voltage control sub-circuit 21 and a voltage output sub-circuit 22, the voltage control sub-circuit 21 is connected with the voltage doubling control port and the voltage output sub-circuit 22, the voltage control sub-circuit 21 and the voltage output sub-circuit 22 are used to control the whole circuit to be turned on at the voltage doubling control port, for example, the voltage doubling control signal DP outputs high level, the second switch tube Q2 is turned on and then the base of the second triode P2 is grounded, at this time, the second triode P2 is turned on, so that the second voltage of the first power supply VCC1 is transmitted to A2, on the contrary, the voltage doubling control signal DP outputs low level, then the whole circuit is turned off. It is worth mentioning that the voltage control sub-circuit 21, the voltage output sub-circuit 22, the first power supply switching sub-circuit 11 and the subsequent driving control sub-circuit 31 and the driving output sub-circuit 32 can be completed by using related or similar circuits or devices, not limited to the scheme described in the application, for example, for the voltage control sub-circuit 21, as long as the circuit controlled by the control signal can output voltage or not output voltage, but at least the third diode D3 is designed to prevent the current from flowing in the opposite direction, so as to ensure the accuracy of the control.

[0108] Further, in another embodiment of the driving circuit of the relay of the application, referring to Figure 6 , Figure 6 Fig. 1 is a connection diagram of the driving circuit of the relay of the application, the relay driving unit 30 includes a driving control sub-circuit 31 and a driving output sub-circuit 32, the driving control sub-circuit 31 is connected with the driving output sub-circuit 32, the driving output sub-circuit 32 is connected with the output end of the power supply switching unit 10, the output end of the voltage doubling unit 20 and the coil L of the relay to be driven 200, the driving control sub-circuit 31 includes:

[0109] A tenth resistor R10, a first end of the tenth resistor R10 is connected with the relay driving signal RD;

[0110] A fifth capacitor C5, a second end of the fifth capacitor C5 is connected with a second end of the tenth resistor R10, a first end of the fifth capacitor C5 is grounded;

[0111] An eleventh resistor R11, a second end of the eleventh resistor R11 is connected with a second end of the tenth resistor R10, a first end of the eleventh resistor R11 is grounded;

[0112] A third switch tube Q3, a gate of the third switch tube Q3 is connected with a second end of the tenth resistor R10, a source of the third switch tube Q3 is grounded, and a drain of the third switch tube Q3 is connected with the driving output sub-circuit 32.

[0113] Specifically, referring to Figure 7 , Figure 7 is another connection diagram of the relay driving circuit in the relay driving circuit of the application, the driving output sub-circuit 32 comprises:

[0114] a voltage suppression diode TV, a first end of the voltage suppression diode TV is connected with a drain of the third switch tube Q3 and a first end of the coil L of the relay to be driven 200, and a second end of the voltage suppression diode TV is connected with an output end of the power supply switching unit 10, an output end of the voltage doubling unit 20 and a second end of the coil L of the relay to be driven 200.

[0115] In the embodiment, the driving control sub-circuit 31 and the voltage control sub-circuit 21 in the relay driving unit 30 are turned on or turned off under the control of the relay driving signal RD, and the relay to be driven 200 does not need to work when the driving control sub-circuit 31 and the voltage control sub-circuit 21 are turned off; the relay to be driven 200 works when the driving control sub-circuit 31 and the voltage control sub-circuit 21 are turned on, and then the voltage at A2 is loaded on the coil L to drive the relay to be driven 200 to open quickly based on the high-voltage coil, so as to improve the driving efficiency of the relay.

[0116] In an embodiment, in order to speed up the relay attraction, the voltage between the two ends of the relay coil is increased from 0V to 2*V1 (V1 is the rated voltage of the relay) by using the voltage doubling circuit 20, the relay attraction is accelerated, the relay attraction time is greatly reduced, and the consistency is ensured. After the capacitor in the voltage doubling circuit 20 is discharged, the rated voltage V1 of the relay is maintained; after being turned on, in order to reduce the power consumption of the coil during the relay attraction operation, the voltage between the two ends of the relay coil is switched from V1 to the relay holding voltage V2 (the voltage of the second power supply VCC2) by the driving control, so that the power consumption of the coil is greatly reduced, and the product reliability is improved; finally, when the relay needs to be disconnected, the holding voltage V2 is directly changed to 0V instead of V1 to 0V, the relay is accelerated to be disconnected, so that the disconnection time is reduced. The power supply VCC2 is a driving voltage capable of maintaining the attraction state after the relay is attracted, and VCC1 is greater than VCC2. For details, refer to Figure 8 , Figure 8 is a connection diagram of the relay driving circuit of the application, and the whole circuit diagram of the whole relay driving circuit is shown in the figure, so as to realize the effects of fast opening, low power consumption and fast closing of the relay by control. For details, refer to Figure 9 , Figure 9For another connection diagram of the relay driving circuit of the application, the voltage doubling circuit 20 and the power switching circuit unit 10 are interchanged, and since the whole circuit core is to open the relay for the output 2V1, the actual voltage doubling circuit 20 and the power switching circuit unit 10 can be interchanged without affecting the output.

[0117] Further, referring to Figure 10 , Figure 10 For a waveform diagram of the relay driving circuit of the application, at T0 time, the power switching signal PC is high to open the first switch tube Q1 in the power switching circuit, and the OP end is charged to VCC1. Since the relay driving signal of the relay at T0 time is low, the voltage across the relay coil is still 0V. At T1 time, the relay driving signal RD of the relay becomes high (at this time, it is assumed that the voltage doubling control port is connected with the driving control port), the voltage doubling circuit 20 and the relay driving circuit 30 are started at the same time, the capacitor C4 is charged to 2V1 voltage and added to the relay coil through the OP end, the voltage across the relay coil rises from 0V to 2V1, and the relay accelerates to attract, in this process, the capacitor C4 of the voltage doubling circuit 20 slowly discharges, at T2 time, the capacitor is discharged, the voltage across the relay coil drops to V1, and the relay will not be damaged due to long time 2V1. At T3 time, the switching circuit relay driving signal PC becomes low to turn off the output of the first voltage VCC1, the relay power RP is supplied by the second power VCC2, and the relay keeps low-power running. When the relay needs to be turned off, the relay driving signal RD of the relay becomes low, the relay power RP directly changes from V2 to 0V, and the relay turning-off process time is accelerated. The above time length can be selected according to actual needs, and the time length is not limited, but the timing of the control signal needs to be consistent with the above.

[0118] Based on the above embodiment, the application further provides a storage energy inverter, which comprises a relay to be driven and the relay driving circuit.

[0119] The drive circuit of the relay and the drive circuit of the relay are arranged in the energy storage inverter, and the drive circuit of the relay can be used to quickly control the relay to be closed, that is, when the relay needs to be closed, the voltage of the first power supply is doubled by the power supply switching unit and the voltage doubling unit, so that the electromagnetic force is increased by increasing the coil voltage in the relay, and the relay is closed quickly. When the relay is continuously closed, the power supply switching unit acts alone, and the voltage during closing is maintained at the second power supply based on the relay drive unit after discharging. At this time, because the second power supply is smaller than the first power supply, the power consumption during the attraction and holding period is reduced, and when the relay is opened, the voltage can be directly reduced to 0 from the second power supply. Compared with reducing the voltage from the first power supply to 0, the voltage drop range of the present application is reduced, and the driving efficiency of the relay is improved. It should be noted that the drive circuit of the relay and the drive circuit of the relay can also be arranged on other devices, such as a driver and a controller containing a relay, and can also be a setting device or a system of the energy storage inverter.

[0120] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or direct / indirect application in other related technical fields based on the inventive concept of the present application, and the contents of the present application and the drawings are included in the patent protection scope of the present application.

Claims

1. A relay driving circuit, characterized in that, The relay's driving circuit includes: A power switching unit, wherein the input terminal of the power switching unit is connected to a first power source, the power switching unit is used to receive a power switching signal, and when the power switching signal is at the on level, outputs the power supply voltage of the first power source as the first voltage; A voltage multiplier unit is provided, the input terminal of which is connected to the power switching unit and the first power supply. The voltage multiplier unit is used to receive a voltage multiplier control signal and output a second voltage based on the power supply voltage and the first voltage when the voltage multiplier control signal is at the on level. The voltage value of the second voltage is equal to the sum of the voltage values ​​of the first voltage and the power supply voltage. A relay driving unit is provided, wherein the input terminal of the relay driving unit is connected to the output terminal of the power switching unit and the output terminal of the voltage multiplier unit, and the output terminal of the relay driving unit is connected to the coil of the relay to be driven. The relay driving unit is used to receive a relay driving signal and drive the relay to be driven based on the second voltage when the relay driving signal is at the on level.

2. The relay driving circuit as described in claim 1, characterized in that, The relay drive circuit also includes: The second power supply is connected to the input terminal of the relay drive unit, the output terminal of the power switching unit, and the output terminal of the voltage multiplier unit. The power switching unit is further configured to output a third voltage of the second power supply to drive the relay to be driven when the power switching signal is at the off level, wherein the value of the third voltage is half the value of the first voltage.

3. The relay driving circuit as described in claim 1, characterized in that, The control terminal of the voltage multiplier unit is connected to the control terminal of the relay drive unit, wherein the voltage multiplier control signal is the same as the relay drive signal.

4. The driving circuit for the relay as described in claim 1, characterized in that, The voltage multiplier unit includes: A third power source is connected to the input terminal of the power switching unit, wherein the voltage value of the third power source is equal to the voltage value of the first voltage.

5. The driving circuit for the relay as described in claim 1, characterized in that, The power switching unit includes a first power switching sub-circuit and a second power switching sub-circuit. The first power switching sub-circuit is connected to the input terminal of the voltage multiplier unit, the second power switching sub-circuit, the first power supply, and the input terminal of the relay driving unit. The second power switching sub-circuit is connected to the input terminal of the relay driving unit. The first power switching sub-circuit includes: A first resistor, the first end of which is connected to the power switching signal; A first capacitor, the second terminal of which is connected to the second terminal of the first resistor, and the first terminal of the first capacitor is grounded; The second resistor has its second end connected to the second end of the first resistor, and its first end is grounded. The first switching transistor has its gate connected to the second terminal of the first resistor, and its source grounded. The third resistor, the first end of which is connected to the drain of the first switching transistor; A fourth resistor, the first end of which is connected to the second end of the third resistor; The first transistor has its base connected to the second end of the third resistor, its emitter connected to the second end of the fourth resistor, and its collector connected to the input terminal of the relay drive unit and the second power switching sub-circuit. The first diode has its anode connected to the input terminal of the first power supply and the voltage multiplier unit, and its cathode connected to the second terminal of the fourth resistor.

6. The relay driving circuit as described in claim 5, characterized in that, The second power switching sub-circuit includes: The second capacitor has its second terminal connected to the collector of the first transistor, and its first terminal grounded. A Zener diode, wherein the cathode of the Zener diode is connected to the collector of the first transistor, and the anode of the Zener diode is grounded; The second diode has its anode connected to the second power supply in the relay's drive circuit, and its cathode connected to the emitter of the first transistor.

7. The driving circuit for the relay as described in claim 1, characterized in that, The voltage multiplier unit includes a voltage control subcircuit and a voltage output subcircuit. The voltage control subcircuit is connected to the voltage output subcircuit, and the voltage output subcircuit is connected to the first power supply, the power switching unit, and the relay driving unit. The voltage control subcircuit includes: The fifth resistor, the first end of which is connected to the voltage multiplier control signal; The third capacitor has its second terminal connected to the second terminal of the fifth resistor, and its first terminal is grounded. The sixth resistor has its second terminal connected to the second terminal of the fifth resistor, and its first terminal grounded. The second switching transistor has its gate connected to the second terminal of the fifth resistor, its source grounded, and its drain connected to the voltage output sub-circuit.

8. The driving circuit for the relay as described in claim 7, characterized in that, The voltage output sub-circuit includes: The seventh resistor, the first end of which is connected to the drain of the second switching transistor; The eighth resistor, the first end of which is connected to the second end of the seventh resistor; The base of the second transistor is connected to the second end of the seventh resistor, and the emitter of the second transistor is connected to the second end of the eighth resistor and the first power supply. The third diode has its anode connected to the collector of the second transistor and its cathode connected to the input terminal of the relay drive unit. The ninth resistor, the first terminal of which is grounded; The fourth capacitor has its first terminal connected to the second terminal of the ninth resistor, and its second terminal connected to the cathode of the third diode and the cathode of the first diode in the power switching unit.

9. The driving circuit for the relay as described in claim 1, characterized in that, The relay driving unit includes a driving control subcircuit and a driving output subcircuit. The driving control subcircuit is connected to the driving output subcircuit, and the driving output subcircuit is connected to the output terminal of the power switching unit, the output terminal of the voltage multiplier unit, and the coil of the relay to be driven. The driving control subcircuit includes: The tenth resistor, the first terminal of which is connected to the relay drive signal; The fifth capacitor has its second terminal connected to the second terminal of the tenth resistor, and its first terminal is grounded. The eleventh resistor has its second terminal connected to the second terminal of the tenth resistor, and its first terminal is grounded. The third switch has its gate connected to the second terminal of the tenth resistor, its source grounded, and its drain connected to the drive output sub-circuit. The drive output sub-circuit includes: A voltage suppression diode is provided, wherein the first end of the voltage suppression diode is connected to the drain of the third switching transistor and the first end of the coil of the relay to be driven, and the second end of the voltage suppression diode is connected to the output terminal of the power switching unit, the output terminal of the voltage multiplier unit, and the second end of the coil of the relay to be driven.

10. An energy storage inverter, characterized in that, The energy storage inverter includes a relay to be driven and a drive circuit for the relay as described in any one of claims 1 to 9.

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